You can find the DN or username for the bind user by opening ADUC, right-clicking a user, and choosing Properties.
To find the distinguished name, click the Attribute Editor tab.
To find the domain and sAMAccountName or the userPrincipalName, click the Account tab. The domain and sAMAccountName is in the User logon name (pre-Windows 2000) fields. The userPrincipalName is in the User logon name field.
