Rp Tutorials

Hi, guys! This is probably a stupid question... but, can someone tell me how to remove usernames that have friended me from my friends list? For example, a handful of characters were removed from a community that I was also a part of, and while I have unfriended them, they haven't unfriended me, so I have a large amount of blue arrows that I'd like to get rid of. Does that make any sense at all? Am I making this more complicated than it should be?

Any help would be appreciated.