Have a Whirlpool over-stove microwave. Can set time but then it scrolls between AM & PM. Cannot find how to set the AM/PM portion, and completing the time set.

Which microwave model do you have? Most of the Whirlpool microwaves that I know only have a 12-hour clock. They do not indicate AM or PM. To set the ones that I know, press Clock. Type in the current time in a 12-hour format. Press Clock again. The only model that I find quickly that has an AM/PM option is the GH7208XR. On that model, start with the main menu displayed on the LCD screen. Touch Settings and Info. Next press Clock. Then press Adjust Time. Follow the instructions to set the time and the AM/PM setting. I'll assume you use the +/- buttons. To hide the clock, get to the Clock Screen. Press Adjust Time and Hide Clock to return to the main menu. See these two pages of the manual for this model: https://www.manualslib.com/manual/190817/Whirlpool-Gh7208xr.html?page=9#manual and https://www.manualslib.com/manual/190817/Whirlpool-Gh7208xr.html?page=12#manual

Current Whirlpool over-the-range models sold in the US are listed here: https://www.whirlpool.com/kitchen/cooking/microwaves/over-the-range.html . Other Whirlpool appliance manuals are available from the Owner Support page: https://www.whirlpool.com/services/manuals.html.

I hope this helps. Please add a comment with the model number for a more accurate information on setting the clock. The model number should be inside the microwave on the rim. Usually it's on the bottom of the door frame near the door hinge.

Cindy Wells