remove dielectric plate.
You don't need it right now.
You might not need it at all. Its for specialized circular sats, of which you are not looking for at this time.
Hopefully the link will work, it shows the alighnmnet indicator.
THis guy has it at 2:00 for some reason, mine pointed down to the ground (at 6:00)
http://www.satelliteguys.us/attachme...1&d=1143472638
also shows good starting point for position of lnbf in scalar ring (how much sticks out)