You will automatically join a channel called 'LookingForGroupAddon'. This channel will be used by the addon to communicate groups!
You may move this channel to a different window or hide it for convenience. It will by default be hidden.
To use this addon, other people need to have it too. When listing a group, only people with the addon can see it. You can delist and relist a group, but it will just reappear for everyone else. Players who login after a group is listed will not see the group though, so keep that in mind and relist often.
The addon itself is really small, so there might easily be issues I don't know about. Let me know if anything breaks!