Please help me! How do I create a Mugen Stage on Fighter Factory Studio?

Hi, guys! Long time, no see; I'm back!

So, first of all, I used Gimp to create my Mugen picture called Graveyard:

1. I inserted my own Graveyard picture onto the pink background.
2. I go to Image/Mode/Indexed and then I clicked OK.
3. I go to Color/Map, and then I dragged the pink square beside Black 0.
4. I exported the picture into Graveyard.pcx.

I have Fighter Factory Studio, and then I used it. I had a hard way to make my own Mugen stage before I save it into def and sff.

Please help me! How do I create a Mugen Stage on Fighter Factory Studio?