Put more pressure to the lips and you can keep your fingers of the both corners of your lips to control the air escaping. Just give it a shot!! YOU CAN DO IT!
Lightly place your thumb and middle finger on your cheeks, kind of where your dimples would be, to keep air from building up in your cheeks. Also play around with more or less pressure When you push out the singing. Sometimes you may be using too much air, causing the lips to separate, or too little air, causing no connection at all!
