Q: I am not able to connect my mac book pro to the airplay mirroring...I need help please

I have set up everything as supposed to.  I have the Apple TV connected to the same wireless as my Mac Book Pro.  My computer is only a couple months old so it is compatable.  I just bought the Apple TV, and when I go to the display on the menu bar, it does not show the apple tv device detected. I dont know what to do.  I need help