FOSS gamedev and creative worlds

I know, i saw this in the other forum. But i couldn't click the link so i have no idea ow to fix this. I searched it up and found to go in the minetest.conf file and rename some stuff. I went to the minetest.conf file and clicked on it. A window came up and it said the file was unknown. I put it on the automatic search thingy and it said it still doesn't know. What did it say on the "Read This before posting a new topic" forum? And how do i fix this? By the way using version 0.3.1 on a Windows XP Home Edition.

The minetest.conf file is a normal text file. Just open it with any text editor (like notepad).