You can add managed domains, servers, or workstations after you install the Administration server. When you add the first managed domain, you must log on using the DRA service account to a computer where the Delegation and Configuration Console is installed. You must also have Administrative Rights within the domain, such as the rights granted to the Domain Administrators group. To add managed domains and computers after you install the first managed domain, you must have the appropriate powers, such as those included in the built-in Configure Servers and Domains role.
NOTE:After you finish adding managed domains, ensure that the accounts cache refresh schedules for these domains are correct. For more information about modifying the accounts cache refresh schedule, see the Administrator Guide for Directory Resource Administrator and Exchange Administrator.