how to add local user accunt to PMP

how to add local user accunt to PMP

When importing all of my member servers into PMP as a resource, I"m trying to add the local Admin account for these resources.
 
I've tried using under the username field: .\username, or local_machine_name\username. Neither of them will work.
 
What is required to add local user accounts in PMP?
 
thanks
robert..

                  New to ADSelfService Plus?