Do you have an SD card, the Homebrew channel, the Savegame extractor, Installer, and ability to speak without using abbreviations?

If so all you have to do is extract your save file onto the SD card from the homebrew channel. After you do that, put the SD card into your computer and open ACtoolkit, from there its pretty self explanatory, open your save file from the SD card, and then use the drop down menus to edit what you want. Save the file after applying your changes and then put the SD card back in the wii and use the Savegame installer to install the save into your wii.