Foliotek is a third-party "Portfolio manager" product used by some CMU courses/instructors. It requires its own account. If you need to use Foliotek for any of your courses, your instructor(s) will provide you with the setup information needed to access Foliotek. These instructions show how it is accessed through the myCMU assignments area.
As a licensed service, Foliotek has their own support team. http://www.foliotek.com