How do you sing from the diaphram?

how do you sing from the diaphram... I can sing slow songs good but I cant sing fast songs yet and I want to learn how to any advise...

My friends say I'm a really good singer and I don't really know if my advice can help you but I'll try. When I was learning how to play the clarinet you had to learn how to keep your breathe really steady and...long! so whenever we ran out of breathe we had to push out with our stomach. So when we push out I guess that would be considered that becuase I do that while singing and my friends, most of my family, strangers I meet when I'm randomly singing, e.t.c. say I sound great. Please note: You might look a little fat, OK you will look fat, but isn't it worth it?

yea I know you have to push out your stomach but I dont have a teacher I just teach myself and I want to learn how to sing fast and im shy to sing in front of my family so I sing in the shower or in my room or just with the music

Feel em! Go crazy while singin them..
Make your heart beat with the drums..
Feel every word as if you're singing about yourself..
Forget everything and everyone around you..
WOW, It's fun, trust me!
I sing too, and I sing both slow and Fast.. Actually it depends on my mood sometimes
I dunno, each one of us has her own way to sing fast/slow songs, so find your own special way girl!