Technology and I don't get along well

[SteampunkWolfdog]

Guys, I need some help -_-'

I'll try to make the situation as easy to understand as possible, but it make not go well because frankly, I don't understand half of it myself. So...here we go...

I'm trying out this video streaming thing on Listen2MyRadio. I found myself on this page here. I watched the top video that showed me how to set everything up, and downloaded the software things in the links. Everything installed nicely and runs okay. When I get to the audio configuring part in the Flash Media Live Encoder, that's where the problem comes in.
Lookie here:

This is the program window...and no audio devices come up. If I plug my microphone in, yeah, that shows up. But I want it to use the sound that comes through my speakers because it's for my radio thing....But...no speakers in the menu.
I don't suppose anyone knows what I'm doing wrong or anything? xD I suck at computers and IT stuff.

Any help will be greatly appreciated, thank you.