You can change your fanfic names, but not your fanfic
gallery name. Well in fact, when you change your username on
your profile, it will also change all your galleries names.
(well, it should) I may add the option to change it
manually, but I would rather that everyone has galleries
with the same name as their usernames.

i can't seem to find "manage my fan fics" on my fan fic
area.

You have to make sure you managed your fanfics. That's where
you're supposed to do in able change it.

Did you go to manage fanfics? Cause, thats where you go to
change it.