The shower hose is in the compartment at the top left of the kitchen.
- Make sure you have enough water in the fresh water tank.
- Insert the hose into the opening under the rear cupboard.
- Turn on the pump (small lever next to the connection).
- The shower can be hooked into the loop on the tailgate.
A visual explanation can be found here:
If no water is running, see fresh water and waste water.