Take the boot out of the binding, just under the letters "PX" there's a little metal tab. You have to pull it up and hold it up (I use a large flathead screwdriver), you can then slide the heel track fore/aft. I *think* all yellow is too little forward pressure, but I can never remember for sure since I don't have to adjust it often. Doesn't matter though, it'll be immediately clear once you move it in one direction if that's right or not. Slide it forward one notch and let the tab click back into place. Then put the boot back in the binding. Repeat as necessary until the window is roughly half yellow (doesn't have to be exact and depending on your mount position and BSL, it's usually impossible to get it exactly half yellow), and you're good to go. You will have to take the boot out of the binding each time to re-adjust it. Note: when it's adjusted correctly, it'll look like it might be too far forward because the boot actually pushes the heel piece back a smidge when you click in.
Edit: Oh, and when you're done, check your DIN since it sounds like you adjusted that by accident.
Edit again: Forgot you said this:
Right now it is yellow and when I snap my boot into the binding the window does not change.
That confirms that yellow means too little forward pressure. Gotta move the heel forward, possibly only 1 notch, but try it and see.
Edited by jaobrien6 - 11/5/12 at 1:24pm