Remove the bath tub from the case, as well as the manual pump. The deflated tub should be spread out on the grass. Open the air valves at the bottom of the tub and inflate half of it with the pump. Then, inflate the tub separately from the other three sections/air valves, working the way from bottom to top. Mind to close the valves securely when inflating into a pipe to prevent air from escaping the shower. Please do not spill boiling water straight into the bathtub. Pour cold water first, then gradually increase the temperature of the water until it is ideal for the baby's bath.