Please Note: You must be logged in as a manager account to carry out these steps. The manager account is the primary account on your vault property.
Log in to the Vault at https://portal.secure-online-booking.com as a manager.
Once you are logged in, Click My Properties at the top of the screen.
Then select the property you wish to remove a user from.
On the row for the user, there will be a button 'Revoke Access'. Click this button and the user will no longer have access to your properties credit card details.
To add an account please follow this guide http://help.myguestdiary.com/en/articles/3582881-add-a-new-user-to-your-vault