By default it added an icon in my Menu Bar and I just select that and then the AppleTV I want. It's a square with a triangle.
What Mac do you have?
I have an iMac, i bought it like 2 years ago
Your iMac is likely too old for Apple's implementation of AirPlay mirroring.
I have an iMac, i bought it like 2 years ago
what?!?! I can do the airplay from itunes, but not the mirroring.
Your iMac lacks the needed h264 hardware encoder that is used to quickly encode the stream for the Apple TV.
How do i see what year my imac is from?
Oh damn, i found it. It says Late 2009
how much do you think it would be to upgrade a 2010 macbook pro so that I could use air play?
AirPlay Mirroring requires a second-generation Apple TV or later, and is supported on the following Mac models: iMac (Mid 2011 or newer), Mac mini (Mid 2011 or newer), MacBook Air (Mid 2011 or newer), and MacBook Pro (Early 2011 or newer).
2 years is too old.
Lame! A new mini can do it, but mid 2010 3.2 Quadcore can't??