ok so most people want to have a better voice and sing like beyonce or rihanna so something like that. if you don't have a good voice, sorry but this wont help you sing like a famous singer or make your voice better. if you try to sing high or push to hard to try and sing a note it might hurt your voice. you NEVER want to hurt your voice because you might end-up having a sore throat or you might lose you voice.to sing a high note you want to open your jaw up wide and make sure your larynx is down not up. if your larynx is up when you sing is it going to go airy and it wont sound good at all.
stand up straight when you sing. Put you hands against the side of your body just underneath your ribs. Try coughing or singing an sss-sound. Feel how the muscles move your hands out. There you have your support which should be used in all singing. The difficuties with using your support is that it should be a constant resistance and not something you turn on or off. To understand this we have to understand why we need our support in the first place. thanks for reading :) hope this helps