How do you set a 4 button digital frog watch?

To set a 4-button digital frog watch, you will typically need to press and hold the "set" button until the display starts blinking. From there, you can cycle through the different settings (such as time, date, alarm, etc.) using the other buttons. Use the corresponding buttons to adjust each setting to the desired value, then press the "set" button again to confirm and save your changes. Refer to the specific watch manual for detailed instructions as the process may vary slightly depending on the brand and model.