To use the Nokia 5110/3310 LCD with your Adafruit CircuitPython board you'll need to install the Adafruit CircuitPython PCD8544 module on your board.
First make sure you are running the latest version of Adafruit CircuitPython for your board.
Next you'll need to install the necessary libraries to use the hardware--carefully follow the steps to find and install these libraries from Adafruit's CircuitPython library bundle. Our CircuitPython starter guide has a great page on how to install the library bundle.
If you choose, you can manually install the libraries individually on your board:
Before continuing make sure your board's lib folder or root filesystem has the adafruit_pcd8544.mpy, adafruit_framebuf.mpy and adafruit_bus_device files and folders copied over.
Next connect to the board's serial REPL so you are at the CircuitPython >>> prompt.