You are a 23 y male but your foreskin has not yet come back. When will it come back and how?

If you're 23 and your foreskin is too tight to be retracted, then it is not going to do so on its own. You can gradually stretch the foreskin so that it can be pulled back. Search for "How do you stretch your foreskin?" in Wikianswers for information on how to stretch.