Navigate to Configuration > Configuration Dashboard > 'LDAP Groups' Widget (add this widget if it is not present on the Configuration Dashboard via 'Add Widget' button located in the upper right of the screen)

The default form will present like this:

Group Name = The User Group that will identify users which should authenticate against your Active Directory. Entering a value here, such as 'Test', will create a user group of the same name (preceeded by 'LDAP%'):

Domain = your Active Directory domain

Domain Controller Server Name(s) = enter the ip address (or name) of your Active Directory server

Once you have input the LDAP details, you can test the connection: enter a username and password, and click 'Connect'. If the settings have been entered correctly, you should receive a successful confirmation notice.

Once you have successfully connected, the last step is to add users to the LDAP Group (ie. LDAP%Test) - accounts which are members of this group will authenticate against your Active Directory moving forward