It should have come with instructions, but the essential settings are setpoint (sp) and differential (dif). Press "MENU" and it should say SP. Press "MENU" again and use the arrows to set what temperature you want it to maintain then press "MENU" again to lock in the value. To set the differential (the range above or below the setpoint the controller will maintain) press "MENU," scroll with the arrows until it say "dif," press "MENU" again and use the arrows to set the differential. Press "MENU" again to lock in the value. I'm sure you can look up he manual online for other settings. Hope this helps.