Press the green flag to start generating! If you want to customize how the terrain will generate, you can press the stop button to make a few options appear! Pen Color Combination is what colors the terrain will have (1 is black-white, 2 is terrain) and smoothness is how many times the generated values will be smoothened (Higher value means longer loading time!)
I got the base for this system from a tutorial, and modified it to make it look better. Also, loading might take a really long time, so I would recommend running this project in Turbowarp, because it will be WAY quicker!