Selecting Decklink Duo 2 inputs and outputs?

Hi all. I'm trying to use a Decklink Duo 2 as an in/out board with Vmix, and while I have BM Desktop Video 12.9 installed, I can't see anywhere in the app where it specifically designates each BNC connector to be either an input *or* an output. (I saw similar results in the 14.x versions of Desktop Video.) Once the card is installed Vmix sees all four BNCs as inputs, but I really need one input and three outputs.

Anyone got any clues for me? Thanks in advance -