You go to the settings, then Data Management, then Wii Memory, then Channels, then click on a channel, the press 'Delete' or 'Erase'.
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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."
New channels can be downloaded from the Wii shop. Though most channels are free there are some that require you to buy Nintendo points to obtain.
The wii games don't give you channels. You have to go to the wii store, which you have to be able to connect to the internet, to buy the channels. Most of them are pretty cheap.
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.
Too many to list, 100+