You can't! The only way to do this is Format the System Memory and then you loose everything.
IF ANYONE IS READING THIS AND DOES'NT WANT TO DELETE THEIR DATA THERE IS A LOOPHOLE BEFORE YOU PLAY CHANGE THE DATE ON THE INTERIOR CALENDER....YOU CAN PUT IT IN 95 IF YOU WANT THEN CHANGE IT BACK.
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From your Wii options menu, select Data Management and then Wii Channels. Select the channel you want to delete and select "delete."
You go to the settings, then Data Management, then Wii Memory, then Channels, then click on a channel, the press 'Delete' or 'Erase'.
Click on the cat/dog on the main Wii Fit Plus screen. Enter into their profile. Then go to the settings/options button and press delete.
you can't
That's impossible.