the way i do it is:

go to friends and contacts (which is in your profile section)

in friends and contacts, you should have a list of all your friends

then at the bottom the incoming requests- i check the box next to the avatur fof the friend, and then their's 2 more boxes.. accept requests, or reject request.

accept is usually checked on it's own so all you need to do is click on save changes.

hope this works out...?