To use the SSD1306 OLED with your Adafruit CircuitPython board you'll need to install the Adafruit CircuitPython DisplayIO SSD1306 module on your board.
First make sure you are running the latest version 5.0 or later 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_displayio_ssd1306.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.
For the Code Example, you will need an additional library. We decided to make use of a library so the code didn't get overly complicated.
Go ahead and install this in the same manner as the driver library by copying the adafruit_display_text folder over to the lib folder on your CircuitPython device.