My fiance logged onto my iphone with his apple ID and now I can't switch it back to my username. How can I change it back to mine? ( but when I go to setting,icloud my un/pw are there)

My fiance logged into my iphone with his apple ID and now I can't switch it back to my username. When I go to buy an app his username is in an editable format to beable to change it back to mine. How can I change it back to mine? (when I go to setting,icloud my un/pw are there) Can someone please help? Thanks!

Had you looked in the User Guide, you would have found this:  Settings>Store.  Tap on AppleID to change.

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