The racks have a turned-up back edge that prevents them from being pulled out of the oven cavity.
Replace oven racks before turning the oven on to prevent burns.
Do not cover the racks with aluminum foil, or any other material, or place anything on the bottom of the oven. Doing so will result in poor baking and may damage the oven bottom.
Only arrange oven racks when the oven is cool.
Pull the rack straight out until it stops.
Lift up the front of the rack and pull it out.
Place the end of the rack on the support.
Tilt the front end up and push the rack in.