How do you become a singer?

Technically you are already a singer. However, if you are talking about celebrity singer, then first you need to believe in yourself. If you don't think you are ever going to make it, then you won't. You have to practice a lot, and don't quit when things get hard. After you got that down, you need to find a way to publish songs and or get publicity. The only way anyone is going to hear your voice is if you share it. Then, as soon as you have all of that down under your belt, you got it! Its a lot harder than it looks though, and a LOT longer. Don't expect to be a professional any time soon, but if you keep at it anyone can!

Hope this helped.