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To change the power level from 100%, enter the length of time, then hit OK, then set the power level with one of the number buttons (1,2,...,9), then START.
Hey Cherim! You can find steps on using the power function on the microwave beginning on page 20 of the User Manual. If you need a copy of the manual, you can download one here: https://bit.ly/2OlBfQJ. ^Jecca