The following instructions are intended to supplement the getting started guid at the main Raspberry Pi site – https://projects.raspberrypi.org/en/projects/getting-started-with-the-pico/0
Firstly open the box and extract the USB cable, the Raspberry Pi Pico and the breadboard. The USB cable will then be plugged into your development machine.
You should then see the Pico mounted as a USB drive, allowing you to add your code.
If it doesn’t you might need to press the bootsel button when you connect.
You will need to install Thonny. Go to https://thonny.org/ then click on the Download link and follow the instructions.
If the interpreter, shown in the bottom right corner, isn’t set to MicroPython you will need to install it.
Click the button to install MicroPython and you will see the following pop-up, select the relevant Pico and click install.
Select the MicroPython interpreter, in the bottom right corner.
Next install the picozero pack, select Tools->Thonny Plugins
Search for picozero and select it
Click install… then close
