To prime a "self priming" pump, you remove the lid to access the pump strainer basket, fill that area with water, replace the lid, and turn the pump on. If the pump does not prime within 30 seconds to a minute, turn the pump off, let it cool down for a while, and try again. Some people find that it works best if you close the lid and turn on the power very quickly after filling the strainer basket with water, for others it doesn't make any difference if they rush or not.