Gun Wont Fill To 190 Psi I Just Bought A Paintball Gun And My Co2 Wont Work Do I Need To Fill It. I'm New To This Paintball Stuff?

I just bought a paintball gun and my co2 wont work do I need to fill it. I'm new to this paintball stuff? - gun wont fill to 190 psi

My weapon is a bat VL I just bought, I also bought a 20 oz PMI CO2 in my weapon, but nothing happens.When first purchase of a CO2 cylinder is full, or do I fill out?