HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedNov 21, 2012 1:22 PM (in response to paul.spencer)
Hope this helps.
Currently Being ModeratedNov 22, 2012 1:30 PM (in response to paul.spencer)
There is no way to change a keychain password without the original password. The only option is to delete the keychain and start a new one. Use Keychain Access. (You could keep a back up of the old keychain file in case you remember the password some day.)