If you have not done so already, launch the Application Manager by selecting Start, Programs, Double-Take, Availability, Double-Take Availability Application Manager.
In order for the Application Manager to manage and administer Double-Take Availability, the user running the Application Manager must be a member of both servers' local Double-Take Admin groups. By default, the members of the local Administrators group are added to the Double-Take Admin group when Double-Take Availability is installed. Users added to the local Administrators group following the Double-Take Availability install will need to be explicitly added.
The Application Manager does not attempt to impersonate the current logged-on user for these credentials. The Application Manager will prompt the user for these credential and they will be cached for later use, provided caching of credentials has not been disabled.
Next step: Assign users to the local Admin group