FOSS gamedev and creative worlds

Howdy Lady and Gents,

I wanted to know is their a way to mod the terrain in a single player game.

I would like to make it as flat as can be.

I heard something about Mapgen and Mgv6 with mapgen_flags =flat.

But the problem is I am quite the noob in this part of the game and have no idea how to add that.

First. Of all go into your Minetest folder. There should be a file called 'minetest.conf'. Open it with any text editor. If there is a line that says mg_flags=
put flat on the end of it. If mg_flags= is not there just add it.