The installation steps are as follows:

1. Turn off the coffee machine: Make sure the coffee machine is turned off and disconnect the power supply.

2. Use a Phillips screwdriver: Prepare a Phillips screwdriver and unscrew the nozzle of the coffee machine.

3. Pry up the nozzle: Use a flat-blade screwdriver to gently pry up the nozzle to disconnect it.

4. Clamp the nut: Prepare a pair of needle-nose pliers and use pliers to clamp the removed nut.

5. Install the nozzle holder: Insert the pried nozzle holder into the rubber part and push it outward to fix it in the appropriate position.

6. Install the nozzle head: Move the nozzle head down along the shaft and ensure that it is correctly aligned with the nozzle holder.

7. Tighten the nut: Use the nut to fix the nozzle head on the nozzle holder. Turn the nut firmly clockwise until the nozzle tip is securely seated on the nozzle holder.