Extension
Login to the Cloud PBX Portal and go to Extensions > Edit Extension > Enhanced Services
Click the Check icon so it turns green > Hit Save
Click the Call Forwarding Edit icon > check the box of one type of call forwarding
Click the Plus icon below and enter the destination number and timeout (seconds) > Hit Save
Ring Group
Login to the Cloud PBX Portal and go to Extensions > Ring Groups > Edit Ring Group
Click Advanced Options > Last Destination > Enter the destination number > Hit Save