Multi-channel recording using Scarlett

I am running Windows 7 Professional, Service Pack 1, and Audacity 2.1.0.

I have a Focusrite Scarlett 18i8 hooked up through USB, running 4 Shure SM7B microphones.

My problem is that Audacity is only registering/recording the first two microphones. How do I make it record the other two microphones?

Thanks in advance,
a.k.a. iawlfan

I’ve never done multi-track recording, but try

I believe your interface came with Abelton Live, and you might be better off using that.