New H23-600 just arrived via FedEX, now what???

i think i am stuck guys - need some input.

i have an existing hr20 HD DVR which is fed from the dish via 2 pairs of coax (dual LNB's). At the entrance to the house there is a block to which these 4 cables connect. from there into the house is 1 pair that run to my DVR which are then connected to B Band Converters and go into the DVR. all good so far.

now i have this new H23-600 which I want to connect to a TV in a different room. I see it only has 1 coax input labeld SWM-1.  At the  block outside the house I have 2 open ports. Can i use one of these to feed my new H23 or do I need some sort of SWM thingy somewhere in the line? what are my options?

thanks!