I finally figured it out! Thank God, but now I'm stuck again on this:
Once you have installed the necessary wad file, you must rename WiiflowR25_249 (or WiiflowR25_222) to just wiiflow
or add the boot.dol to a newly created "wiiflow" folder in the apps directory.
How do I rename it? Do I take the SD card out of the wii and rename it on the computer or what?