Okay well i dont exactly know how to help you so ill just tell you how i have always installed them:
Download both emulators from wiibrew:
FCE Ultra GX - WiiBrew
Snes9x GX - WiiBrew
Extract them both directly into the root of your SD card (or usb)
Place your roms directly into:
snes9xgx/roms/ <--- For super nintendo
fceugx/roms/ <--- For nintendo
Done! everything should work great just launch the app from the homebrew channel and select your game.
-I would make sure the above process works before attempting to install the forwarder channels.
To install Forwarder Channels:
1. Download both forwarder channels from the wiibrew links above <click download - download the file that says channel installer>
2. Extract both of these Directly to the root of your SD (or usb..)
3. On your wii
-Go to homebrew channel
-Click on the installer
-Do this for both channels
now you should be completely done. though i would remove the channel installers from your SD card (there in the apps folder)
i hope this has helped somewhat.