Instructions
Click the envelope icon in the bottom right corner of the Wii's main menu.
Click "Address Book," then click the right arrow to see your addresses.
Click the "Register" option, then select "Others."
Enter your own computer email address, then press the "OK" button.
Type in a nickname for the email address, then confirm. This will save your email address in the Wii Address Book and send an email to your computer email address.
Log into your computer email account and reply to the message from your Wii. This will send a message to the Wii system and cause the slot to light up. As long as you do not open the message, the slot will remain lit up.