Q: how do i authorize my computer

Have you signed in, if yes go to the Account Menu, choose Authorizations>Authorize This Computer

Hi Vince,

To authorize computer, please follow the steps below.

From the menu bar at the top of your computer screen or at the top of the iTunes window, choose Account > Authorizations > Authorize This Computer.

To know more on authorizing computer, please see the link below.

Authorize your computer in iTunes - Apple Support

Thanks.