how do you remove the original plate from the tripod? I removed the 2 screws but the head does not appear to move.
Not sure what you are referring to in your question as the Titaal QR plate attachs to your camera and not the tripod. The plate slides in and our of a clip on the tripod and there is usually a button that you push that allows the plate to slide out of the clip.
does the tripod come with a plate?
Yes, the tripod comes with one plate, but it is sometimes handy to have more than one, such as for another camera, so that you don't have to keep moving the plate from one to the other.