*sigh* this is really sad...
This is one of the most basic of basic task. Anyone who has ANY KNOWLEDGE of emulators should know how to do this.
First you need to find something Called a Bios, downloading this is illegal but no one on this earth cares >.>.
Here is the link
http://www.emuparadise.org/biosfiles/gba-bios.zip
extract the file (unzip) and then put the extracted somewhere on your SD card, doesn't really matter where.
Now go to gameboid and it will ask for the bios, navigate to the area where you put the bios on your sdcard and your done.
Now just incase you dont know anything at all.....
To actual add the games to gameboid you need to get the ROMS for the games. To do this you can google search "[insert game name here] rom" or you can use the search rom function built into the gamebroid. You dont have to extract (which is nice). If the game doesn't work then its just because your phone/emulator simply can't handle it.