This thread is refering to Sonos audio integration specifically. Sonos is not connected to your panel, so it cannot be added/removed from the panel. It is integrated through the Alarm.com account directly.
It can only be added by the end user, not removed. Only the dealer can sever the integration…
Steps on how to add various devices, like Sonos, can be found in the How To section of the forum, The Sonos integration guide can be found below: