Well, What kind of adapter is it? Any ethernet wire to wireless game adapter will work. What I did with mine was just plugin one end of the ethernet cable to the ps3 and the other to the wifi adapter. Most of these wifi adapters, especially those made by linksys should have a button on the side to change modes for online capability. The one I'm using is set on "ln" mode. Once the that's configured, go to your ps3 network settings and just do an easy configuration so that it automatically sets you up for PSN.