Goldie has an auto-warming switch in the back.
Slide the switch to the on position (toward the wavy lines icon) when you want your starter to be in the Goldilocks Zone (75-82ºF). Slide it off (toward the crossed-out wavy lines icon) when you want your starter at room temperature.
When you slide the auto-warming switch on, the bottom (gold) lamp in the front will turn on.