How do you press start on GBA n PC?

To press start on a Game Boy Advance (GBA) emulator on a PC, you typically need to use the keyboard. The default key for the "Start" button is often the "Enter" key or the "Z" key, depending on the emulator settings. You can also customize the controls in the emulator's settings menu to ensure they match your preferences. If you're using a gamepad, the corresponding button you set for "Start" will function as well.