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First log into the domain controller you want to hold the roles and launch a command prompt and run the following:
 
C:\system32\admin>ntdsutil
 ntdsutil:  roles
 fsmo maintenance: connections
 server connections:  connect to server "domain controllers hostname"
 
you will now have confirmation of connection to the server
 
server connections:  quit
 
Now you are ready to transfer the FSMO roles.
 
fsmo maintenance:  transfer schema master
 fsmo maintenance:  transfer rid master
 fsmo maintenance:  transfer infrastructure master
 fsmo maintenance:  transfer pdc
 fsmo maintenance:  transfer naming master ("domain" not included when running from a 2008 DC)
 
You have now transfered all the FSMO roles to your 2008 R2 domain controller and can logout of ntdsutil
 
fsmo maintenance:  quit
 ntdsutil: quit
 

In order to confirm all FSMO roles have transferred to your desired destination run the following:
 
C:\users\admin>netdom query fsmo
 
Schema master               server.domain.com
 Domain naming master    server.domain.com
 PDC                               server.domain.com
 RID pool manager           server.domain.com
 Infrastructure master        server.domain.com
 The command completed successfully.