Nah, you're not bad at it -- it took me ages to figure it out as well

Try this one:
Code:
http://imageshack.us/photo/my-images/191/requestbyjetthomasboatt.png
If that doesn't work, try this: When you're in imageshack looking at your images, there's a little button directly to the right of the image that looks like an "i". When you click on that, you should get a lot of ways to share your image. You want the 4th one down, "direct", when you're going to be putting up an avatar.