yeah their manual sucks. I am trying to setup a trade script with them, but since I have an older version than you do its even less obvious lol. You can try to hit up the programmer guy, but he isn't the most responsive and helpful.
basically you just place your out.php url in the last set of quotes, i.e. ("TRADE_SCRIPT", "/out.php?url=[URL_DECODE]");
I don't know what he meant by URL_DECODE but that should help a little
