Looks like it's linked to an old thread from before the new forums.

Profile > Edit Profile > Add Widget > Click on the Edit button for the Widget section > "Edit Profile Section" - "Please read the Widget Information Here! This only works for widgets created for subeta"

The "Here" link is http://subeta.net/forums/?act=read&topic=50415

Not actually sure where it should be linking too.

Link was removed. :)