rom filter help

hey there when i try to filter the roms it does not work or i just simply dont know how to use =S i try to filter the roms for rpg games only and nothing appears can somone teach me how to use the filter?

I'm pretty sure it doesn't work because none of the games have any genres set to them. People used to be allowed to set genres to games, but people started messing around with it. So now no games have a genre.

aw that really sucks ;( i have a hard time finding a good rpg that i can kill time with .
thanks for letting me know fredbox