At the start, you can press multiplayer and it will come to a player amount screen. You then choose the amount of players you want to play. You do not have to have that many wii remotes though. You can just use one to rotate around with. Then you come to a mii select screen and you can choose who you want to be in order of the players.
e.g. If you are playing with 3 players and three remotes, first the first player selects their player with their remote. The the second with their remote and so on.
If you are only using one remote, you select players in order of their connection. e.g. P1 first, then P2 and so on.
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There is now the Wii Fit Plus (an addition to Wii Fit) which allows multiplayer mode.
You can only play multiplayer on the Wii Fit Plus, not on the original Wii Fit.
In Wii Fit Plus, you can add your pets, such as your dog.
The Wiimote Plus attachment will not fit in the Wii Steering Wheel however the new wiimote version has the add-on built in and will fit.
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.