How to remove another Apple ID from my iPhone?
How to remove someone else Apple ID, when u can’t get in contact with that person
[Re-Titled by Moderator]
iPhone 5
Remove it from where?
For Apple IDs signed in to iTunes & App Stores, Messages and FaceTime you can just sign in, in the relevant locations.
Settings->iTunes & App Store->Apple ID, Settings->Messages->Send & Receive, Settings->FaceTime->Reachable at
For Apple IDs signed into iCloud, you cannot remove it without the password. You will need the password, no way around it. You will either need to get in contact with the original owner, or return the device for a refund.