Remove old appleid

You can sign out of an Apple ID in Settings>Your Name. The option to sign out is at the bottom of the screen in red text. Though it should be noted that you will be required to enter your Apple ID password in order to sign out of this account if Find My iPhone is enabled. If you don't know your Apple ID password, then you'll need to reset it. You can find those instructions here: https://support.apple.com/en-us/HT201487.

• Go to Settings/Messages
• Turn it on
• Now you will see Send & Receive
• Tap on it
• Tap on your Apple ID
• Tap Sign out

Go to Settings/{your name}, scroll to the bottom and tap Sign Out. Do the same for Settings/Messages, Settings/FaceTime, Settings/iTunes & App Stores.

There are no settings. Did you enter the correct password for the old ID when you tapped Log Out?

Go to Settings>Messages>Send & Receive and touch the Apple ID that's signed in and choose to sign out.

Turning off iMessage is not sufficient. You must follow the instructions posted bypanchososa694.