Basal thermometer

Any advice on how to track ovulation with a basal thermometer would be do appreciated. When to start tracking? How to track? What the temps mean? It's confusing! I don't understand all the lingo. Been trying to conceive actively for over a year and casually (thinking if we are having unprotected sex and The Lord wants to give us a child it will happen ) for 2 additional years. No success and I'm getting very sad and depressed. The basal temp is my next attempt to track my fertile days. Please help.