[
the root of SD card]/
apps/
myHomebrew/
boot.dolClick '1' if HBC is not autoloading from the SD and select SD.
Find it. If there wasn't a meta.xml file it would be at the end of the list.
Also avoid using IOSs if you don't know what they are. Just download
Gecko OS and run the game from it's disc (assuming you actually imported it).