By Lielle ben simon, 20 May, 2016 Forum Other Apple Chat Hello! the last day i would like cross to windows, I used in mac the last year, and hes has bein stolened. if i authorized one computer on iTunes, how can i cancel my authorize remotely? thanks Options Log in or register to post comments Comments Hi. As far as I am aware, the Hi. As far as I am aware, the only way to de-authorise an individual computer is on that computer itself. If you need to de-authorise a computer, you actually have to de-authorise all computers, then re-authorise your current computer. 1. Open iTunes and navigate to the iTunes Store. 2. Go to your account and sign in. 3. De-authorise all computers. 4. Re-authorise the computer you are now using.