Setting up the bridge requires placing it under the strings between the f-holes. You need to place the bridge precisely in the middle between the small slashes on each f-hole. The bridge should be facing with the slant going towards the E string. This can be a confusing process, so I've included my favorite video to help you here. I recommend letting a luthier do this with a Cecilio violin. During this time, they can also check for any other problems with the violin.