1 Step 1: Go to the Norton website and ‘Sign in’. Once you’re signed in go to the top right corner ‘My Account’ and then select ‘My Subscriptions’. 2 Step 2: Move your mouse over ‘Manage Devices’ and click the trashcan icon next to your Mac device. 3 Step 3: After you removed it from the list on the website go to your Norton program and click ‘Account’ in the lower left corner after clicking Account press ‘Sign in’ once you pressed Sign in just log in with the same credentials as on the website. Step 4: You may now click ‘Enter a Key’ there you fill in your product key and click next. Tip: If the ‘Next’ button does not turn yellow check for spelling errors.