Maytag Refrigerator Ice Maker. Our new house has a Maytag RTD1900 top freezer refrigerator in it,

Question

Our new house has a Maytag RTD1900 top freezer refrigerator in it, for which we do not have the owner's manual. The freezer compartment has the option ice maker installed, and looks like it is plumbed in. We cannot figure out how to activate the ice maker. Any assistance would be greatly appreciated. Thank yoU!