Click the "Account" button on the top right of the window if you are not signed in. Sign in with your account information. This will replace the button with your account name.
Click your account name on the top-right corner of iTunes. If you see an "Account" button instead, you are not signed into iTunes. Click it and enter your Apple ID and password.
Select "Account" from the drop-down menu beneath your account name.
To play music, videos or other files purchased from the iTunes Store, your computer must be registered or authorized with the Apple ID that was used to purchase that content. You can have up to five computers authorized through your Apple ID at one time. If you no longer plan to use a computer, it is important to deauthorize it from your Apple ID before disposing of it. If you have already reached the maximum number of authorized computers, you can deauthorize all computers from your Apple ID. If you have less than five authorized, you can only deauthorize one computer at a time.
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