I assume you mean an HPA fill station.
You connect the fill hose to the fill nipple of your tank by pulling the collar on the fitting at the end of the hose away from the tank, while pushing the fitting towards the tank.
There will be some sort of lever, button, or knob you will push to open the valve to fill your tank. Once the pressure gauge on your tank reaches the "FULL" mark (either 3000 or 4500psi, depending on your tank), you release the button/lever/knobzperiodz
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At a 3500-4000 air compressor. Talk to the field refferees and ask them to show you how to properly and safely fill the tank.