- Log in to the domain controller using administrative credentials.
 - Open the Active Directory Users and Computers tool.
 - In the navigation pane, choose the group to which you want to add the user.
 - Right-click the group and select Properties.
 - In the group’s properties window, select the Members tab.
 - Click the Add button.
 - Select the users you’d like to add, then OK.
 - Click the Apply button to confirm your changes, then OK to close the window.
 
