It has always worked that you put the person's screen name in the blank & hit the "add friend" button & it sends them a friend request but without the "add friend" button you can't do that.

I have done it in my phone before so this is something new & was wondering if it is a phone issue (I have an android) or a change here on PC.

I got a PM asking to become friends because they ciuldn't figure out how it worked & when I went to send them a friend request that was when I realized I couldn't because it was missing.