To get to your planet, fly through the black hole into Central Space and say hi Bing and Bong on their flying couch as you pass them on your way through yet another black hole to the Nebula Neighborhood.
First visit Terra Mart in Central Space and buy some mountains, a Moon, whatever you want to add to your planet. Then fly to the Nebula Neighborhood.
Use the green side to side arrows to choose to change skies, ground, mountains, trees and orbitals (moons and satellites).
Click the red up and down arrows to select your planet items.
Or you can click the swirly red and green Random button to change your planet automatically. You don’t lose your skies and mountains - you can always use the Planet-o-matic to put them back.
Click the big brass “Save Your Planet” button, to save the changes you made.