A dash light says "hold" to the left of the green rear wheel indicators. What does this mean?

I discovered a switch that operates the transmission's settings. Children had been playing in the car while parked, and hit every button, or switch in the car. Hold, delays, or almost locks the shifting point. Readjustment is all it needed. It also has a setting for towing too, I discovered.

hi there! which button did you hit? and what kind of readjustment did you do? My left rear wheel indicator is on green. what does that mean?