Hi @tcsempire, good evening, thanks for reaching out.
Assuming you only have one valve and no pump, I would connect one red wire to either white common terminal and another red wire to the green zone 1 terminal. For reference, please see the Iro wiring guide.
I always recommend pushing in the square tab with the diagonal line when you insert and/or remove a wire. This will allow you to easily enter and remove the wire(s) without resistance from the internal mechanism that puts pressure on wire.
Hope this helps.