The usage of the icons at the top of the screen should be clearer. Clicking on one should cause an icon to appear to the side of the mouse picture with the words "Settings for" above it, so people know what clicking on the icons does.

Currently, clicking on an icon may result in no change to the screen below, or a subtle change if the buttons have different settings for the application. Since nothing pops up and there's no message, it's easy to miss the function of clicking on the icons.