Mexican citizens must have a TN visa to enter the US and therefore, must apply at a US Consulate or Embassy abroad.  It is recommended that Mexican citizens apply in Mexico since officers in those consulates are more aware of the TN visa regulations and procedures. Appointments can be made online through the department of state website or by phone.  To be issued an appointment, complete and submit Form DS-160 online.  The application fee is $190 and can be paid online.
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One-sentence summary -- Make an appointment with a US Consulate or Embassy. Pay the application fee and complete the application form.

Q: Crossover steps are a simple way to move around. You simply cross one foot over the other, letting your momentum continue moving you backward. For this explanation, all of the examples will be to move ‘’’right.’’’ To move left, simply switch the feet in the directions. Crossovers can be done moving forward or backward, but to practice, you should start from a standstill. Set your skate down on the ice with your legs crossed at the knee. You should look a little like a young kid who needs to go to the bathroom. Uncross your legs by bringing your right foot around the back of the left and setting it down on the ice. You should be back to your original standing position. Keep crossing over to move laterally across the ice. Try a few in reverse if you are comfortable, put your left leg behind your right before bringing the right foot over the left. You can push off the wall, make perfect “S” shapes, or speed along with “C” cuts. Gain some momentum and then relax, gliding backward. As you move backward, cross your left leg over your body then quickly uncross your legs with your right foot. When done correctly, you should shift horizontally while maintaining backward momentum.  Think of the motion you make if when you start running to your right. Your left leg takes a step to the right and then your right leg quickly follows.  Practice Drill: Do two "C" cuts, one with each leg, and then one crossover. Do two more cuts, then a crossover the other direction. ’’’Practice Drill:’’’ Skate backward around the edge of the rink, and use crossovers to change direction in the corners. Skate both clockwise and counter-clockwise to practice both directions.
A: Use crossovers to change direction while skating backward. Stand up straight, knees slightly bent. Bring your left foot up and over your right foot. Bring your right foot behind your left calf. Repeat this crossover motion to move horizontally. Start gliding backward. Perform a crossover to change directions.

Article: During its first month or two, the chestnut tree will need 1 gallon (3.8 L) (4 L) of water each week. After the first month or two, you should still make sure that the tree receives 1 inch (2.5 cm) of water each week during the growing season. You do not need to water the tree when it loses its leaves and becomes dormant. Weeds and grasses should be kept at least 2 feet (0.61 m) (61 cm) away from new seedlings. For established trees, keep the ground bare all the way out to the ends of the tree's branches.  The best way to do this is by applying organic mulch around the tree. Mulch also helps the soil retain moisture. An herbicide can be used to get rid of weeds, as well, but you need to protect the trunk of the tree before you apply an herbicide to the area. You can apply fertilizer to the tree on a yearly basis starting its second year outdoors.  Do not fertilize the seedling when you plant it. Doing so will encourage leaf production, but the tree needs to focus its efforts on root production during this time. Use a standard fertilizer containing balanced amounts of nitrogen, phosphorus, and potassium (usually labeled as 10-10-10 fertilizer). During the tree's first two or three years, you should train it to follow a modified central leader form.  Pick a sturdy central, upright stem. This will be the tree's central leader. Pinch back, bend down, or cut off any other stems that compete with your chosen leader. Major scaffold limbs growing off your main stem should be spaced 1 foot (0.30 m) (30.5 cm) apart along the central leader, growing in a spiral rotation. After the tree establishes itself, trim the limbs so that the lowest still gives you enough room to mow under the tree. When the central leader reaches 6 to 8 feet (1.8 to 2.4 m) high, cut it down so that it is as short as a side branch. This will allow the tree to grow wider instead of higher. Chestnut blight is the only major disease you will need to worry about, but it can present a significant threat.  The fungus gathers around the trunk of the tree, fixating mostly on areas that are cracked or wounded. It eventually develops into a large canker. When the canker wraps all the way around the tree, the tree itself will die. You will need to completely remove the tree and plant any future chestnut trees in a different location. Chestnut blight is almost impossible to treat once it infects a tree, even if you use a strong fungicide. Prevention is your best option. Plant blight-resistant chestnut tree varieties and make sure that the roots are never allowed to sit in soggy, overly-wet conditions. There are several different insect pests that may attack your tree, but the biggest problem is usually the chestnut weevil.  Adult weevils lay eggs in developing nuts. When the eggs hatch, the larvae consumes the meat inside of the nut. Get rid of the weevils before they become a problem by spraying the tree with an insecticide once nut burs begin to develop. Alternatively, you can lay a sheet beneath the tree and give the branches a sturdy shake. Most of the weevils should fall off. You can then collect them in the sheet and dispose of it. You need to kill the adult weevils before they can lay eggs. There is no way to remove the pests once they find their way into the nuts.
Question: What is a summary of what this article is about?
Water regularly. Keep the weeds under control. Fertilize during the second year. Train the branches. Watch out for chestnut blight. Protect the tree against insect pests, as well.