Leaving Messages on Wii: Wii Message Board Is Dead—Modern Alternatives

The Wii Balance Board has no messaging function. It's a controller peripheral. You're likely thinking of the Wii Message Board—which was shut down June 28, 2013 with Nintendo Wi-Fi Connection.

What the Wii Message Board Did

• Sent text, photos, Miis to Wii Friends (registered via Friend Codes).
• Received game notifications (Animal Crossing: City Folk visitors, Pokémon Mystery Gifts).
• Accessed via Wii Menu envelope icon.

Modern Replacements

• Miiverse (Wii U/3DS): Also shut down (Nov 2017). Archives at Archive.org.
• Discord / Reddit / Forums: Active Wii communities: r/wii, r/wiihacks, Discord servers.
• Nintendo Switch Online: Play select Wii games via NSO Expansion Pack; use Switch friend messaging.

For Wii-specific discussion, join a community forum or Discord. The native messaging ecosystem is gone.