How to get my iphone off of guest iphone and back onto my iphones name?

I synced my phone clicked some where and then it showed up as guest iPhone and i restored it and now i lost everything and i can't get them back and i don't know what to do apple won't help me and i don't remember where i clicked to get my information back i don't know where a backup is and i didn't use icloud please help i'm so frustrated

Sync it with your own iTunes you've sync it before

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