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Go to https://www.facebook.com/. This will open your Facebook News Feed if you're already logged into Facebook. If you aren't logged into Facebook, first enter your email address and password in the top-right side of the page. This tab is in the upper-right side of Facebook, and has your first name on it. Doing so opens your profile page. It's a tab just below your cover photo that's near the top of the page. This option is in the upper-right side of the "Friends" section of the page. Clicking it opens the "People You May Know" page, which is a list of people that Facebook recommends you add based on your current friends. It's a blue button to the right of a person's profile. This will send a friend request to them. Click Add Friend next to more people on the "People You May Know" page to send out multiple friend requests. The more people you add, the more friends you'll have. Most people will accept a friend request from you if they see that you have friends in common.
Open Facebook. Click your name tab. Click Friends. Click + Find Friends. Click Add Friend. Add more friends.