...and then press the little button the number of times you want. The rate starts at 1 (least force) up to 8 i believe. The more force, the more likely paint is to break under the strain and so 8 is only recommended for pretty hard paint. When you turn off the hopper and then back on again and press/hold the button the LED will flash the number of times you've pressed.press and hold the button on the back till you see the light flashing.