Sunset lamps are designed to mimic the colors of a sunset, so the color of the lamp will change automatically over time. However, some sunset lamps may allow you to adjust the color settings manually. To do this, you may need to consult the instructions that came with your lamp. In general, you should be able to change the color of your sunset lamp by using the controls on the lamp itself or by using a remote control, if it comes with one. Some sunset lamps may also be able to be controlled using a smartphone app.