2D Gameplay Tutorial - Main Camera

I've been following the 2D Gameplay Tutorial (the one with the character Lerpz in it), and I've come across a problem at the end of page 19. Under the "Directing the Camera" section, I'm told that, in the "Target Button Name" group, I should change Size to 1, which I have. Once Element 0 appears, I'm supposed to type "Player" into Element 0's slot. Well, the program doesn't seem to let me type anything there. I'm guessing this is because the way you do it for Unity version 3 is different, but I still don't know what to do.