In order for you to be able to access your iTunes account's media such as music, videos, book and more, you need to authorize your computer.
Summary
To authorize a new computer in iTunes, follow these steps...
- In iTunes, click the 'Account' menu item.
- From the drop-down menu, navigate to 'Authorizations > 'Authorize this Computer...'
- Enter your Apple ID and password to confirm the authorization.
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Detailed Steps
First of all, make sure that you are signed in to iTunes on your computer. To Sign in, open iTunes > Account > Sign In... You'll need to enter your Apple ID and Password.
Once you are signed in and iTunes knows who you are, you have the power to authorize and de-authorize computers on your iTunes account. You can only have a certain number of authorized computers on any one account, but we will address that in a minute.
To authorize your current computer, navigate to 'Account' > 'Authorizations > 'Authorize this Computer...'. Will will need to provide your Apple ID and password again to confirm this task.
Running out of authorizations
You can only have 5 authorized computers on an iTunes account at any one time. If you wish to de-authorize computers on your account, you can do so in one of two ways.
To de-authorize a single computer, open iTunes on the computer in question, then navigate through 'Account' > 'Authorizations > 'De-authorize this Computer...'.
If you instead wish to de-authorize all computers on your iTunes account, go to 'Account' > 'View my account' > Enter Apple ID and password. Then, under the 'Apple ID Summary' heading, click 'Deauthorize All'. All of your computers will then be deauthorized, so this is a great way to clear spaces if you forgot to deauthorize old machines that you no longer have access to.
Now you can authorize new computers if you wish