Launch Hakchi2 if it's not already running and select Tools from the menu bar at the top of the Hakchi2 window and ensure that there is a check-mark next to FTP server on ftp://root:[email protected]:1021. Leave Hakchi2 open or the FTP won't be able to connect.
Launch FileZilla or use your preferred FTP client.
Enter in the following information and connect.
Host: 127.0.0.1
Username: root
Password: clover
Port: 1021
If all went well you should see the SNES Classics file system in the FTP client.
In the FTP client Navigate to /var/lib/hakchi/rootfs/usr/share/games/ and copy the game folder we just created (CLV-P-DNA64) onto the SNES Classic system. Once the transfer completes power the SNES Classic off, wait a moment and then turn it back on. Browse the list for your newly added game!
If you don't see it, double check the .desktop file and make sure everything is correct. If it still doesn't show up, review the guide or try a different game. See below for more on this.
Now repeat the process to install more games. - Enjoy! :)