Hey that's the same setup I've got.
There are several ways you can do it, but here's what I do.
Plug the mics into mixer channels 1 - 4.
Pan channels 1 & 3 hard left, and pan channels 2 & 4 hard right.
Push the white buttons on the bottom of channels 1 & 2 so they light up. On channels 3 & 4 leave the white buttons off & push the Group 1-2 buttons.
Plug 2 cables into your Stereo Out jacks on the back of the mixer (either xlr or 1/4"), and plug the other ends into the 1st 2 inputs of the delta 44.
Plug another 2 1/4" cables into the Group Out jacks on the mixer, with the other ends going into inputs 3 & 4 of the delta 44.
Now you have mixer channels 1 - 4 routed to delta inputs 1 - 4