Should note that its sometimes difficult to see the area where you delete the account. When you log in go to "options" at the top of the web page to delete account.
Don't delete the account!!! The device has to be removed from Protect.
So hopefully you did not follow my previous instruction : Do this:
1. sign into BBID via the link I gave above using a PC.
2. Click on "Manage Devices"
3. Click on Remove
4. Then in Z10 go Settings/Blackberry Protect/ tap off