Regardless I can't remember the order you get to it in, but if you look at the entrances/exists to barrows, look for the one marked with an ankh (cross with a loop at the top)

It'll be fairly easy to find in normal game, just wander about barrows, however with the BDJ mod everything is a bit twisted and hard to navigate. I'm sure someone else could give you directions, this reply's just for speed ^.^