How do I properly install the turntable before using the microwave?

Place the roller rest on the cavity bottom first, then place the turntable on top of the roller rest with the turntable hub securely locked in the receptacle — never place the turntable upside down. Both the turntable and roller rest must always be used during cooking, and the turntable's rotation should never be restricted. All food and containers must be placed on the turntable for cooking. (Page 8)