How to add to Big World Variations

[thehobbesian]

I've been playing TripleA for over a decade now, and have only just now started to get into map making. I've created a variation of Small's variation for Big World (under the Big World Variations download). Is there a step by step guide somewhere as to how I'd go about uploading it so that it is downloadable by anyone, either as a sub variant of Big World Variations or as its own map?