Ok then look at your image there if you want to see your image the alpha channel has to be black if you don't want to see the image make the alpha channel white. White is the clear parts black is the solid light don't pass threw parts. You need a black solid image to be able to see it. Understand? Notice the alpha part is completely black? You need it that way too make it work in this case. ( In the tutorial?) If it's not black there is a invert button there, the square button with the white circle. Click it. If you cannot see your image in the next screen on the right there then you got it goofed up. It must apear on the right, It's what will render. Notice his picture is there twice? You need it that way before you got it right. It will work then. He's saying don't worry about it cause the picture is a square. Usually it's not like a leaf. In that case only the leaf will be black and the rest white on the alpha part. Look at the tutorial about the sign in the book. See the sign alpha picture? It's that way so only the sign shape will render and not the entire square original picture.