I'm DYING to get started, help a new user out?
If you are using the 2.20 final release of Hakchi2, then yes, you need to select original games to have the default 21 games on your list.
When you first start Hakchi2 it will ask you what kind of system you will be using. If you have a Super Nintendo Classic Edition, for example, then you would choose "SNES Classic Mini" from the list.
Make sure to click the "Kernel" menu and choose "Dump Kernel". Just follow the instructions that pop up. When that is done, make a backup copy of the file you just dumped, and keep it somewhere safe. Next click on the "Kernel" menu again and choose "Flash Custom Kernel". When that is done, you will be ready to add games.
Click the "Add More Games" button, go to where you put your roms (they must be .sfc or .smc format to work) and start adding them, one by one.
Most games you add will auto fill in all of the game info for you, including if it's 1 or 2 players. It won't give you the box art by itself, but you can add that very easily. Just select the game and the click the Google button. When you see a picture you like, just double click it to set it as the box art for the game.
Just choose "Synchronize Selected Games With NES/SNES Mini" when your done adding games to the list, and Hakchi2 will tell you what to do to flash the games to your SNES Classic.
That's the best I can do for you. That's all I currently know.
Good luck!