Custom MiniMap Images

[ReZIP]

Alright, well I understand they gotta be in a certain type of format, but where the in the nine hells is this uploader or whatever it's called so that I can use it? I'm all too confused. If you can give me a walkthrough as to what to do that would be great.

 

[Stardragon]

There is already an tutorial on this one in another thread.
Read below anyways.