How to add friends on Facebook?

         Find the profile of the person you want to add using the search or any other
         way (eg: from your friends profile).

         You can go to their profile/timeline and you will find the "Add Friend" tab.

        

         On the old profile pages, this tab is present at the top right of the page.

          On the Timeline, you can find it right under the cover pic at the right.

The old profile page

The Timeline

•   Simply click on the "Add Friend" tab and your friend request will be sent.
•   The "Add Friend" will change to "Friend Request Sent".

Request Sent

           Your request is sent and you will receive a notification when the person accepts
           your request.

         PS: Send the friend request only to the people you know in real life.