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Jun 18, 2015 6:26 AM in response to evbe71by Michael Black,You need to change the password of the AppleID you use to login to iMessage - see this for instructions: Change your Apple ID password - Apple Support
Once you've changed your AppleID password log out of iMessage and then log back in with the new password. If you use this AppleID with other services like FaceTime, iCloud, iTunes or App Stores, you will have to log out there as well and log back in with the new password