Export your project as an .exe or whatever and upload it to platforms like gamejolt.com and itch.io. Those sites are meant for indie game developers to host their games.
What these guys said.
When you've done that I'd love to have a link so we can try it out. Always cool to play finished gamemaker games!
If you'd rather not share it then that's cool too.
The only tutorials I can find are for older versions of Game maker. I have the desktop version of Game maker studio 2. How do I go about exporting a standalone app of the game to share with my friends?