Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
To get started, I need to know what version of mac osx you have on your macbook, you can check as follows.
Click the apple sign at the top left of your screen, then click about this mac. And then where it says version, send that to me as a reply.
Also, do you know what model or generation of apple tv you have?