How do you sing high note and sing with your diaphragm??

The responses that say "use your diaphragm" are correct, but, you should be doing that no matter where you're singing in your range. Singing higher is not something you can just "do". You have to practice at it, and some people really just aren't buit to sing high. Everyone has a range in there voice. If you're looking to expand your range, work a little on your upper range, then come back and use your more comfortable range, then go down low, and continue that. Slowly, you will start expanding your range upwards. Yes, singing with your diaphragm is great and all, but, you didn't ask how to sing properly, you asked how to sing a high note and use your diaphragm. Sing really low in your body, and never ever abandon proper singing technique.

singing high with your diaphragm requires A LOT of control. make sure your using a very classical tone, very little nasal. If you're singing with your diaphragm, it should he considerably powerful and loud, plus you'll feel your abs or upper abs flexing. do some singing exercises to strengthen your diaphragm, and you'll start to really feel when you're pushing with your gut, not your throat << bad. exercises: make you hand a fist, put it to your mouth, like you're holding a sucker, but all the way to your mouth, and with pressure, push out air really fast and really powerful. your hand acts as a resistor to the air, and works out your muscles. might make you light headed if you do it a lot, but helps work those abs and your diaphragm.

Why would you sing with your birth control??? Would you blow into a condom???