Open the valve cover. Most air mattresses have either a one-way air valve, or a simple hole on one side of the mattress. Locate this first and remove the cap. This is the only place you’ll want to pump air into it.
Start pumping air into. You can either do this yourself or with an air pump machine. Be aware, if you do this yourself, to take your time because you might air yourself out and KO.
Screw the latch back on. Once the mattress is finally filled with air, be sure to latch the hole back closed. Don’t want air seeping out during your slumber.
This is how to inflate an air mattress.