To be able to play The Blind King, you need to have completed Chapter 1. Upon completion of the chapter, the quest Prince of Persia will appear within the World & Characters section of your quest log.
Track the quest to the Valley of the Kings in Megaris. Interacting with the blind man will start the quest.
If The Blind King does not appear in your quest log, the information in this FAQ might help.
If you have any questions, feel free to contact us!