I Can't Access My Blackberry Messenger

I can't access my blackberry messenger its asking for a blackberry id which I do not have as I brought this phone off someone else, I don't know the password so I want to change the blackberry ID but how do I do this? Why can that person see what contacts have if they no longer own this phone and have no way of finding that information out is it because of the blackberry ID

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KB05041-How to move the BlackBerry Configuration Database to a remote Microsoft SQL Server
... Configuration Database Current folder -P Specifies password " " (blank) -p Specifies ... Database Complete the following information: Client Access Licenses (CALs) Server Routing Protocol Identifier (SRP ID) SRP Authentication keys Settings...Change Database button. Task 5 - How to move the BlackBerry Configuration Database to a remote Microsoft SQL Server KB05041 03-19-2010 Additional Information...
KB00588-Password security for the BlackBerry smartphone
... Enter Type the new password again, and click To change a BlackBerry smartphone password : If you are composed of identical characters (for example, 1111) or passwords that consist of the information on their BlackBerry smartphones. Password security for the BlackBerry smartphone KB00588 12-21-2009 Additional Information Passwords are running BlackBerry Device Software...
KB03847-How to perform a cutover of the BlackBerry Enterprise Server in a Novell GroupWise environment
...BlackBerry Enterprise Server Record the configuration information. For more information, see KB05041 Task 3 - It is no longer connected to the network. Click Change Database. Confirm that the source ... Server and the prompt for the service account password appears, change the default value under the heading for the client access license (CAL). BES1 Old BlackBerry Enterprise Server ...