I dont know how to play multiplayer

can you play mutiplayer on 1 computer?

Yup! The keyboard supports up to two players. If you forget which keys belong to which player, then use the keyboard help button:

You also can connect game controllers to your computer to support up to four players. Pretty much anything that your computer recognizes can be used with MakeCode Arcade: gamepads, joysticks, flight controllers, etc.

Ok, Thanks!