Making Game Over work

Hello everyone. I’m making a game and trying to get the game over screen to work.

I would like to know two things; 1) How can I give a command for the game to return to the main menu and 2) What is the command to open the load menu? I know that to save it is save_prompt.

main menu: menu_return

load game: ??? I tried to figure out a way yesterday but i dunno. I use game over to go to the menu and then you can load from there.