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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Hi! What type of computer do you have?
Also, what are the lights on the Pico doing? Are both of them on? are they pulsing? are both off? and did they flash at all?
If you have a Windows PC, you will probably have to install some drivers first (even for the bootloader). Also if you're using a USB extension lead it's worth making sure it works by plugging some other device like a USB key into it (sometimes they'll charge stuff, but are no good for data).
There's info about the drivers in the Quick Start guide here