Sync iPhone with another computer? (different apple id)?

My sister bought a new iPhone 6 and plugged it in to my imac, it synced with my itunes and apple id, now she tried to sync it with her computer and got a message saying it can't be synced if it's not with my imac. What can she do?

Why can't she ask her own questions?

She can use one Apple ID for syncing. Tell her to choose an Apple ID and to stick with it. She must sign in to her iPhone with that one Apple ID. She must sign in to her Mac with that one Apple ID. Apple can't let people share purchased music with the entire world. It is limited to the Apple ID that was used to buy the songs and to five computers that are signed in with that same Apple ID.

I have always thought it was silly of Apple to allow people to create more than one Apple ID, but not let them use more than one Apple ID.

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