Widgets from external sources like Ning, Reverbnation etc, can now be embedded into Artist pages. 

To place the code on the page, go to edit your artist info (there's a small icon that looks like a piece of paper with a pencil on it towards the top right of your page - this is the edit icon).

Goto: Artists  |  Click on your name  |  Locate the edit icon.

In the description editor, click on the small icon that has "red left and right arrows" on it.  This gives you the html of the page where you can place your widget code.

Save at the bottom of the page.

You can re-edit your profile at any time.

See: http://crew.globalthundanetwork.com/how-to-faqs/32-external-widgets-on-artist-pages-yes-you-can.html
Also See: http://crew.globalthundanetwork.com/how-to-faqs/33-how-to-edit-your-artist-page-and-albums.html