This tip is from the
Motorola Owners Forums in the Cliq section as posted by user
fletch33.
Making the change
If you want to change your Gmail account with the lock on it then:
1. Go into the gmail account and turn off in this order: AutoSync then Background sync
2. Go into manage applications and delete data for gmail, gmail storage, and Google Apps (you have to click on each one, and click clear data) - you should see the data line read 0.00B
3. Go back to accounts - you will still see Google with a lock, but clicking it causes it to disappear and starts the gmail wizard.
You can then enter the settings for the account you want to change to.