For both Windows and Mac users, the process is the same, however, if you are a Windows user and you don’t see the menu bar appearing, press Ctrl+B on your keyboards.   You can authorise up to 5 computers, which means that you will be able to access your content in five different computers. It is also necessary that one checks the number of authorisations so here are the steps for you to follow how to do it:  

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How to authorise a computer on iTunes - 17How to authorise a computer on iTunes - 2