Strategies To Lose Weight Fast

I am tall and thin, but have too fat a belly for my weight. I do not want to lose weight, and am actually trying to gain weight. However, my belly is also expanding as I do this. How can I lose weight in only my stomach and no where else? I have tried exercises targeted for the tummy, but was told I need to burn/melt off the fat first using cardio so the toned muscles will show. How do I melt away the pounds from only my stomach?

My body is a good size, except on my thighs. They are pretty big compared to the rest of my body. It looks stupid and unbalanced. How can I lose weight in my thighs without losing weight anywhere else?