I just purchased a wide angle lens as well as a telephoto lens for my dvx100b. My question is: How do i set the camera to Wide Angle mode, so that when i shoot using the wide angle lens the image doesn't look vignette?
There is no "wide angle" mode. Depending on the wide angle lens' focal length, you may or may not get a vignette. You can either zoom in enough so it goes away, which may degrade the quality, or you can just deal with it. My fisheye gives some vignette in the corners and I personally don't care. I think it looks good.