U2413, 2012 Retina Macbook pro

I'm having a bit of a problem. I received my new monitor U2413 today. I gave connected the available cables that came with the monitor to my 2012 Retina Macbook pro. All I get it a floating message No DISPLAYPort Cable. I have read a few tutorials and read some info here on the forum but to no avail. There has to be a simple way yo get his monitor up and running. What an I doing wrong? Please advise which Cable I should be using and what do to.

Thank you!