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Hi Leona, Thank you for your question. According to your owner's manual, before setting the blade height, remove the start key and the battery pack. To lower the blade height, grasp the height adjustment lever and move it toward the front of the mower. If you are unable to adjust the height for your mower, there is a likely an issue with the wheel adjuster. The wheel adjuster usually has a pin attached to it that locks into the notches on the quadrant. The adjuster is attached to the wheel bracket so when the adjuster is moved it moves the wheel up or down. Most wheel adjuster problems are the result of wear. The pin that locks into the quadrant will wear over time, causing its edges to round off. When this occurs it will tend to slip out of the quadrant, especially when the mower goes over a bump in the lawn. Sometimes the pin will even break off so the adjuster can no longer be set at all. A close visual inspection of the adjuster and quadrant should lead you to the offending part. The parts that make up the wheel adjuster for your lawn mower have been discontinued and you need to contact Ryobi for information on replacements. If they provide you with part numbers for the parts, please feel free to contact us and we will verify if we carry them. If you have any questions, please let us know!