Getting started with Plexamp

So… I’m on Windows 10. I have added a folder in PMS for Music, and I have music in my Music folder on my PC.

I start Plexamp and… I see Library Radio and Time Travel radio. Both do nothing when I click them. I search for music I have and I find nothing.

Is there some place I’m supposed to store music? Is there a way to point Plexamp to where my music is?

Help?

edit: found the Plexamp icon buried in my Windows tray. Right clicked > Source was pointing to my Nvidia Shield instead of my local machine. All good now.