There should be very few reasons to change the settings for a Dynamic DNS Update User.  Use these instructions in the event that you need to change information for an Update User.

To Edit an Update User
1. Select the Manage Account tab and then the Manage Users menu item. Manage Account menu
2.  Select the Update User to edit and click the Username. User name list
3.  Click Edit to change the settings for the user. Edit button
4.  Make the necessary changes and click Edit [username] to save the changes. Update user edit user