this is not a supported modification to the Power CMS System.
you would need add a column to the cms2_content to mark the content as featured.
create a page that returns a listing of the members content records and add a link that passes the content ID to an Update record behavior to update the content record and set the featured column to 1 for that record and 0 for all others.
if you need assistance adding this to the cms system, I suggest signing up for a premiere support appointment.