HELP! what should i do about fat?

im pretty slim i just have a big bely, right around the bottom part of my belly on, ive been trying to streighten and flatten it out with situps, and i have seen some great results so far, but the fat right bellow my belly on wont go!!!it just hangs! and i cont lose any more weight. like actual pounds. I just want to flatten that annoying partout. How? PLEASE HELPME.. Thanks:)