It is impossible to find your password if you don't already know it, because you are prompted to enter your apple ID and password after the first step, but to view/change the password, open iTunes,...
click on 'Forgot Password?' next to the place where you type in your password. After you verify your email, you have a choice of getting an email authentication, or you can answers a security...
In what? You need to be more specific if you want someone to be able to answer your question. Do you mean in a game? If so, what game? Or in what program, if not a game?