Gary4,
Run two lines from the dish to the switch.......use the two ports that say 18v &13v and not the one that says ant.
THEN run any two lines from the other end of the switch to your receiver. Connect one to sat 1 and one to sat 2.
Your receiver will say "searching for signal until it gets one. You may need to retune or "peak" the dish.
The multiswitch can be near the dish.near and/ or replace the ground block. It can be at the back of the receiver. If you only have the one recorder.(I think the PLUS is a HD receiver.......in which case this whole deal is a wast of time...anyone? Plus = HD?)
Anyhow, let's pretend it is a recorder. If you are only running the one recorder you don't need a multiswitch....just two lines from the dish.
Keep on truckin,
Joe