How To Change 11 repo to a 12 repository

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http://forums.fedoraforum.org – I have been using Fedora 11 for awhile now & would like to upgrade to Fedora 12. But where in the repo's do you change from 11 to 12. Example: When you change the repo's in Ubuntu or Debian its fairly easy because you just change the name or number of the distro in repo file. But fedora repo's are a bit harder to understand's. Could someone give us an idea or post their 12 repositories. Thanks (HowTos)