How do I authorizing iTunes on my new Mac?
Posted on May 3, 2016 12:24 PM
Q: How do I authorizing iTunes on my new Mac?
Learn how to authorize or deauthorize your computer with your Apple ID.
http://support.apple.com/kb/HT1420
You need to log into iTunes on the computer you want to deauthorise. Otherwise, contact iTunes Store support to see if they can help.