The satellite is in the direction of the azimuth number. Hold the angle finder with the flat side horizontal and the pointer should read zero. Rotate until the pointer reads the angle of elevation, and sight along the flat surface in the proper direction as found by the compass, and you will be looking right at the satellite. Use a chair, box, or other object as a steady-rest to make these sightings easier. Remember that a compass can be thrown off by a car or other metal object.
Elevation is angle from horizontal.
A DBS dish can be mounted on the roof, wall, chimney, deck, a pole in the ground, or any other sturdy surface that you can fasten to. Read the directions and warnings that come with your particular system before you start. Dish location should be determined before you buy the dish to be sure that you have a suitable location you will be satisfied with and the dish will work properly. Locate where the dish is to be mounted, go in the attic and drill a small pilot hole up through the roof on each side of the nearest rafter. Go back on the roof, seal the two holes with silicone sealant, and mount the dish foot over the holes with lag bolts screwed into the beam between the two pilot holes.