To see your activity board, check the instructions explained on the previous entre named "How do I see the activity related to my profile (comments, friend requests, likes)?"
Once you have located your activity board, you can see the people that have sent you a friend request. If you want to accept that person from seeing your profile click on "Accept." If you don't want that person to see your profile, click "Delete."
This action only has to be done if you have set your account on private. If you have your profile set to public, anyone can immediately follow you.