There are several solutions depending on the model, whether it is Grammer or Isri. Look under the seat (from the steering wheel side) there should be a lever and it is caught on a notch in the seat base. You have to unplug it from this tooth by lifting the lever up and that it won't give up easily, it's best to help yourself with a screwdriver. In another model, the security features are in the rail on which the seat moves, then you need to move the seat forward as much as possible, prepare two thin screwdrivers and find holes on the sides of the seat, locate the spring in them (steel rod) that blocks the seat, push it down and at the same time remove the seat. Note - the spring can be on both sides of the seat and sometimes only on the left. Otherwise, a plastic lever in the same color as the other operating buttons of the chair is mounted in the front seat, it must be pulled up and the seat removed.
