Add the username or group along with the Domain. For instance:
MyDomain\AUser
MyDomain\AGroup
In Enterprise Manager,it'll look like:
If you want to use SQL, such as through Query Analyzer, use sp_grantlogin, which is for adding NT user accounts. For instance:
EXEC sp_grantlogin 'MyDomain\AUser'id=code>
id=code>
K. Brian Kelley
bkelley@sqlservercentral.com
http://www.sqlservercentral.com/columnists/bkelley/
K. Brian Kelley
@kbriankelley