You use the arrows. E to enter. Use the sliders for the mass. (BTW in this version you can only use the B and A-types) Press the add icon to add a body! In this version you can add only 3 bodies! To move the icy moon, press w or s. For the rocky moon you press the up and down arrows. For the other planet press the left and right arrows. PLEASE LIKE AND SUB
credits to @LukeOLD3B