Why does my iTunes not work with my iPhone?

I have an iPhone 5 that I had to send in for repair, so I got a 4s from the shop to borrow.
I plug it in my iTunes, and I get this screen - image
I've clicked on everything, and it won't go away. If I go up in the top left corner and click that little thing, the ''Show info'' is also greyed out. Any idea why? My iTunes and the 4s IS up to date.

Did you try bringing up sidebar, clicking on the summary page and enabling manual management?

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