How can I enable Apple ID

Have you forgotten your ID or is it showing disabled or locked?

Apple ID is locked or disabled

If you have changed your password, have you followed the steps in this article?

What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.

If necessary, contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.

iTunes Support

iTunes Support – world wide

See this article Create and start using an Apple ID - Apple Support