Connect Sat1 feed to LNB1 (or port1) on DiSEqC switch. Connect Sat2 feed to LNB2 (or port2) on DiSEqC switch. Connect "Receiver" or "output" port on switch to LNB input on receiver.
In the Antenna Setup menu, set Satellite to the name of Sat1 feed. Set LNB freq to "Universal (9750-10600)" Set DiSEqC1.0 to "Port1". Leave DiSEqC1.1 on "Disable" & Motor Type to "off".
Do the same for Sat2, except set DiSEqC1.0 to Port2.