How to authorize my Toshiba Satellite?

My computer won't let me use my iTunes because it says I need to authorize my computer. It's a Toshiba Satellite C875D - S7330. Does anyone know hoe to authorize it or at least transfer my iPhone music to my iTunes?

Means iTunes does not know this computer you must let it trust the pc you installed it on be sure to log in to your iTunes if not make a free account

Try logging onto your Apple account using your Apple ID. Then you will be able to authorize the computer from that point.

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