This is probably one of the most complicated (by brewers) things in brewing IPA's etc. Funny thing is, it's so easy that people complicate it unnecessarily. Transfer your beer to a secondary (one of the only reason's i can think of for doing this) and add pelleted hops. Usually one once per 5 gallon carboy. No need to steam, boil or any other type treatment as long as the hops come right out of a clean (preferably sealed) container of hops. Whole hops are ok, but harder to get in the carboy and MUCH harder to get out once they are in there! So, next time you want to dry hop, just do it.. make sure the beer is mostly done fermenting by doing a hydrometer reading or if you are one member of this forum, by doing some sort of strange native vulcan mind meld with the beer. (just kidding) Add the hops, let sit for 10 days or so, rack and keg.. If you want to really do something daring, get an extra large tea ball, fill one half with pellet hops, clamp the other side closed, drop it into a keg along with the beer, carbonate and be amazed.. good luck!
Ken