Setting the pressure switch on a well pump involves adjusting the cut-in and cut-out pressure settings. Here's a step-by-step guide on how to do it:

1. Turn off the power supply to the well pump to ensure safety.

2. Remove the cover of the pressure switch. The pressure switch is usually located near the pressure tank and controls when the pump turns on and off based on the water pressure.

3. Locate the two adjusting screws on the pressure switch. One screw is for adjusting the cut-in pressure, which is the pressure at which the pump turns on. The other screw is for adjusting the cut-out pressure, which is the pressure at which the pump turns off.

4. Use a pressure gauge to determine the current water pressure in the system. You can attach the gauge to a hose bib or a pressure tank valve.

5. Adjust the cut-in pressure screw to the desired setting. Turn the screw clockwise to increase the pressure or counterclockwise to decrease it. The recommended cut-in pressure for a well pump is typically between 20-40 psi.

6. Adjust the cut-out pressure screw to the desired setting. Turn the screw clockwise to increase the pressure or counterclockwise to decrease it. The recommended cut-out pressure for a well pump is typically between 40-60 psi.

7. Once you have set the pressure switch to your desired settings, replace the cover and turn the power supply back on.

8. Test the system by running water and checking if the pump turns on and off at the desired pressures.

It's important to note that if you're not comfortable or familiar with working with electrical equipment, it's best to hire a professional to do this for you.