Upgrade from release candidate to final version

[Jesus Arocho]

I updated from 7 to hardy release candidate to test the new version.  I now 
want to move from the RC to the final.  The update manager does not have the 
upgrade icon and when I run update-manager -d the response is that the system 
is already up to date.  The repositories used are hardy-proposed.  Must I 
edit the repository list manually?