http://www.dual-boxing.com/profile.php?do=editprofile

Scroll down to "World of Warcraft Characters"

input your Region, Server, Faction, and Toon's Name, you MUST follow this format:

Code:
US|Madoran|Alliance|Baylen
US|Madoran|Alliance|TheRuiner
US|Madoran|Alliance|Menage
US|Madoran|Alliance|Aahh
US|Madoran|Alliance|Trois
1 toon for 1 line.

Click on "Save Changes"

You're toons will show up on your profile as you can see on mine: http://www.dual-boxing.com/member.php?u=9879

As well as under my rank, you should see a WoW Characters link that opens a small portion to display my toons. The input field is limited to 1,000 Characters (Keyboard characters, not WoW Characters) So don't go too nuts on it.