Place the back edge of the Mat-thingy vehicle seat protector against the vehicle seat back. The front flap should extend out toward the front of the vehicle seat edge, wrapping over the front edge.
NOTE: If the front of the Mat-thingy does not fold over the front edge of the seat, the Mat-thingy can still be used as long as the back edge is against the vehicle back seat. Do NOT fold the front section of the Mat-thingy under the main section.
With the Mat-thingy laying flat on the vehicle seat, place your Clek car seat or booster seat firmly on the Mat-thingy centering the seat between the LATCH (UAS) anchors or vehicle belt anchors. Shift the Mat-thingy as needed to position it so that the car seat or booster seat is within the raised edges of the Mat-thingy.
Install your Clek child seat or booster seat according to the seat's instruction manual.