ineed to chang my Apple ID number

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

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