I dont want to lose any more weight. I just want to get rid of the flab of my belly. Should I eat some more and do more weight training or ab exercises to strenghth myself?

The only way you're going to lose fat but not weight is if you compensate with muscle. Easiest way I can think of is to add a bit more weight to your strength training days.

It all comes with time my friend. I have already went threw p90x once and this is my second time. Reguardless of that i was losing weight on my first run threw, now that im on my second time i am not seeing any weight loss but still i am getting stronger. It could also have to deal with what your eating or how much body fat you actually have.