You cannot hack into profiles. The other user put a password on their profile because they did not want people to see their weight, age, etc.
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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 go into profile settings, click on your password then press remove i just did it!
Don't hack play games legitimately ;)
There is now the Wii Fit Plus (an addition to Wii Fit) which allows multiplayer mode.
Wii fit plaza is the place where you choose your mii, or your person, so that you can do the wii fit test for the day.