If you have done all of that you have done what deleting a friend request requires. This could be a browser issue (I just attempted to delete a friend request myself and it worked, so the forum seems to be okay) and may well need the remedy I noted in you other thread, namely trying it in an alternative browser you haven't used before. If that fails I'll see if I can get a video of the process up; if your actions mirror mine and it still fails we'll have to keep poking at the issue.