When I opened the terrain editor (Place by slope, height, water level, etc.) there was only about 5 terrains, I noticed they were in a different folder located in Add-Ons, so I went into that folder and added some new terrains, opened up F11 and went to the terrain editor, yay they're listed!
But when I apply one, it's just the dirt texture, this happens with all of them except for the ones that were already in there.
What am I doing wrong?