Welcome to the forum.
Most likely if you have basic Createx, it just needs to be thinned like 1:1 paint to water, basic Createx is thick stuff. Also try running your pressure at 35-40 psi. If you do not have a regulator, keep adding water slowly till it sprays good. If this doesn't work, take the front of the airbrush apart and soak the parts in alcohol, remove the rubber seals first to avoid damage . You may have gunk on the inside of the nozzle.