ineed to chang my Apple ID number

Do you mean your Apple ID, which is your email address, or some phone number associated with your Apple ID?

To change your Apple ID—>Change your Apple ID - Apple Support

To change a phone number, log in to https://appleid.apple.com and look under Security

Do you mean the telephone number associated with your Apple ID? If yes, see this --> Add or remove your phone number in Messages or FaceTime - Apple Support