download any of them, then select import image stream in effectslab or compositelab under the file drop down menu and locate your download. Select it and then go under media over to the right where effects and info are located. It should be under there. Drag your clip onto the timeline. If it does not have a pure black background, click grade under your object on the timeline and over to the right select contrast: pro. If your object has a background with some white in it (which can cause your screen to become a little whiter which can be a problem when making your quad smaller than your base video clip) just make the black about 20 or 30 or so, and move the white a little bit down as well. If you have something like smoke in your clip, move the white down more than the black goes up to make it more visible.