New to spray tanning and need help with spray gun

[Bzmsmom]

I have a California tan spray machine and gun the model is L22424 and I have used it several times practicing. It seemed to be clogged do I took it apart and cleaned per directions. Now it just blows air, no solution is coming out. The trigger to the gun seems really lose but it doesn't have a nut to tighten, is there something else I can look at to tighten trigger