To rename a certain page open it first.
Go into edit mode and hope that it is not locked by another editor right at the moment.
On the bottom you should see a Rename button. Click it.
A dialog box appears asking for the pages new name. Enter it there and proceed. Another window pops up asking again if you really would want to proceed.
Think twice at this point. All links leading to the old pagename will be broken.
If you confirm here everything is done. The page gets its new name if the name you chose is not already in use by another page.
Otherwise a message will tell you and you start in the edit view all over again.
manual:rename, Rev. 1, Last changed on 2005-02-16 09:23, 12365 page hits