The Content Panel is all about customising the actual content you send in response to certain events:
You can choose which message you are looking at with the menu at the top.
Then change the subject and content of each message
The checkbox below is used to set whether or not this notification is on or off.
There are currently 4 messages that BRM sends to your customers;
Adhoc - when you're in a reservation and want to communicate about that reservation with that customer
Post rental - when you want to follow up and see how they found your service
Provisional - optional automated response to a provisional online booking
Confirmed - automated response to a confirmed online booking