LibreELEC does see my flash drive

I want to store my music files on a flash drive on my raspberry pi. I know little about Linux or raspberrys. How do I mount a flash drive? I don't see anywhere to get to a terminal window.

Thanks

But I don't see it. Can you tell me where in libreelec it would appear or what I'd need to do to use it?

Thanks

Unless I'm stupid. I just tried another flash drive and it works. Something wrong with the other one. Thanks for the help. B