Why can't you make the screen bigger in No$GBA emulator?

like I said as the subject thing. anyway any help? really need it thanks.

use no$zoomer

There are some addons that able to make No$gba screen bigger,
such as MyZoom, Nds2xGL2, and No$zoomer.
Most users use No$zoomer because it offer some game fixes for no$gba, as well a Mic support.
Download the full package from here.
http://www.mediafire.com/?0tmrvozm0gmRun No$zoomer, and select your game.

U can change your screen resolution to 800x600