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Tip the bucket toward you first, then drag some of the grout toward you and along the side of the bucket. This will give you a “working batch” of grout to use at first. Scrape the float tightly against the bucket to make sure you get a decent amount to work with.  A grout float is a flat, handled tool used to apply grout. You can find a grout float at any hardware store. This technique also prevents any grout from spilling onto the floor when you go to take some out of the bucket. first by pressing down on the joints. Position the float at a 45-degree angle along a joint, press the float into the joint, then run it along the line to fill in the joint. Turn the float onto its side to scrape off the large globs of excess grout on your tiles.  Repeat this process to fill in all of the grouts you intend to fill on your wall. Just don't allow too much time to pass before you do some cleanup work. Do not apply grout to any expansion joints. These are the gaps at the edge of a floor or wall, and especially at spots exposed to water, such as the edge of a bathtub. It's important to start by grouting your wall tiles instead of your floor tiles, since you'd have to walk on top of your newly grouted floor tiles in order to reach the wall. Use a damp sponge to gently wipe any remaining excess grout off of the surface of the tiles. For best results, clean the sponge after each short swipe. Wipe in a circular motion to most effectively clean the tiles. Press down on the sponge with your index finger as you run it along the grout lines to smooth them out. You don't have to press down too hard; your goal is just to make sure all of your grout lines are at consistent heights and depths. It's fine to use the same sponge that you used in the previous step, so long as it's been thoroughly cleaned first. Stepping aside for half an hour should allow the grout and water on the surface of the tiles to form a dry, easily removed haze. For best results, use a microfiber towel to wipe off this haze. You can also use a cotton towel, but microfiber towels work best for quickly and cleanly removing the haze from the wall. Now that you've completed the tiles on the wall, it's a good time to grout any tiles on the floor that you need to grout as well. The process of grouting the floor will be the same as grouting the wall. Just make sure you're ok with not walking inside this room for 24 hours, since this is how long it will take the grout on the floor to cure.

Summary:
Load your grout float by scraping it against the side of the bucket. Apply the grout to the wall tiles Allow the grout to dry for 20 minutes, then clean the tiles with a sponge. Use a sponge to smooth out any high or uneven grout lines. Let the grout dry for about 30 minutes, then wipe the tiles with a towel. Repeat these steps to grout your floor, if necessary.