Need some additional information. Do you you mean that nobody showed you how to set the thermostat? Or do you mean that you'd like to understand the sequence of operation of the heater,how the safety controls work? Or do you mean that you know how it is supposed to be operated, but it just does not work right?
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch