Ok so installing and testing flash is easy.
1 get the file on your phone
2 install it...astro can do this, along wwith many other apps
3 open browser (I use dolphin hd) and go to your favorite flash website (minus hulu, and ign doesn't seem to work) try tvshack.cc if you can't think of your own
4 once u have loaded a page with flash on it, you will see an aero in the middle, click it
5 wait for it to load, then enjoy. Long press to bring up options, double click to center.
If for some reason it doesn't work, then maybe there is something not right with the file you got or your rom. I can only confirm this on BB 0.4.