Hi brander175,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
You don't tell us what unit you have, but if like most of the units there is a knob on the opposite end of the light that you twist. It's not just real visible if the light is pointed straight down, it's between the hanger arms.
Enjoy the forum and your new unit.
Jim M