You adjust an RDA in many ways. If it happens to have adjustable airflow then you can easily do that, it will be a ring in the outside cap you can turn to match differnt size holes up or something like that. The other ways to adjust come from how you wrap that coil I mentioned (how many wraps, how big around the wraps are, what resistance the wire is you wrap it out of, etc.), how you wick the coil (simple cotton ball cotton threaded through the coil, silika you wrapped the coil around, etc.), where you place that coil (high, low, in front of air hole, etc.), what voltage or wattage you set your PV on, what juice you put in it, and other factors as well.
