Putting a cushion on a rocking chair depends on the type of cushion you’ve purchased. If the cushions have straps, you will need to tie the straps to the backrest and seat of the chair to ensure that the cushions don’t slip. If the cushions don’t have straps, you will need to place the seat cushion first, followed by the backrest cushion. If you bought one long cushion for the chair, put the cushion on the chair and adjust it to make sure that it doesn’t slide off the chair.