How do you add a playlist on your gaia profile page?

Make sure you are logged in and scroll the mouse over the "My Account" tab.
Scroll all the way down the list of links to the very last last one which should be "Account" and click on it.
That should take you to your "Edit Profile" page. Look at the list of link on the right side of the made which should consist of Preferences, Alerts, About Me, etc.
Go down the list to where it says Profile in black (since it is not a link). Underneath it should be three links, Theme, Preference, and Multimedia.
Hit Multimedia and a box should come up where you can paste your multimedia code.
Make sure you have the ;classic; option on and the multimedia will appear.