Unscrew the cap and you'll find it's attached to an air valve with a 'white' cork stuffed into it, this is the intake air valve.
Remove the cork and make sure the air deflate valves on the other side of the mattress are closed.And then use your foot or hand to pump the area around the inflate valve. With each step, you want to make sure that your foot rises over the air inflate valve so the bladder underneath can suck in air with each stroke. 2-3 mins are about how long it should take to inflate. You don't have to fill it up too much, just adjust the firmness to as comfortable as you like.

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