Texturing in GMAX

I've been following this tutorial:
http://www.windowlight.co.nz/simplebuilding.html
Been good to me so far, very detailed, but I can't get the "apply" button to light up for me so I can actually click it and apply my texture.
Followed all the instructions to the letter, what am I doing wrong here?
http://www.windowlight.co.nz/simplebuilding.html
Been good to me so far, very detailed, but I can't get the "apply" button to light up for me so I can actually click it and apply my texture.
Followed all the instructions to the letter, what am I doing wrong here?