How do I safely add a forgotten dish after the dishwasher has already started?

A forgotten dish can be added any time before the main wash begins. Push the door latch to the left, wait for the water to calm, then open the door (steam may rise out), add the forgotten dish, close the door, and push the latch to the far right. (Page 13)

From the official GE GSD3715 Built-In Dishwasher manual, page 13

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