Instructions
Go to one of the websites that provides Gameboy, Gameboy Color or Gameboy Advance ROMs.
Click the specific number or letter of the desired game and then click on the game link.
Download the ROM to your Downloads folders. ROMs usually come in "zip" format. Locate the zipped folder and extract the file by right-clicking and selecting "Extract All."
Start Visual Boy Advance. Click "File," and then "Open Gameboy." Locate the VBA ROM file just extracted and click "Open." The game will start in a few seconds.