theres the manual...or if your too lazy to look through it then follow these steps:
-hold the trigger while turning the gun on
-pull the trigger to cycle through the settings until the light blinks green and orange
-hold the trigger til the light goes out then pull the trigger twice...when you pull the trigger it should blink red.
after you pull the trigger twice wait and then the light will blink a combination of all the colors very fast.
-you have now set your gun to PSP mode...you can now hold the on/off button till the gun turns off or cycle through the settings some more
hope this helped