In the Folders pane under the configuration file you want to work with, right-click the Relay Server farm you want to add Relay Servers to and click New » Relay Server.

Ensure Enable this Relay Server is selected.

Enter the path information for the Host you want to connect to. Click Ping to check that a connection can be established to the specified host.

Select the communication protocol to use. This can be HTTP or HTTPS.

Specify the port(s) to be used for the selected protocol(s).

If desired, type a description of the Relay Server in the Description field.

Click Apply to continue adding Relay Servers or OK to add the Relay Server and close the Create Relay Server window.