MicroMod STM32WB5MMG Hookup Guide
Installing Arduino Board Definitions
The STM32WB5MMG Processor is included with the STM32duino STM32 Arduino core. Installing this core requires adding a JSON file to the "Additional Boards Files" field in the Preferences menu. Open this by navigating to "File > Preferences" and then either paste the JSON link below into the field or click the button to the right of it to open a larger window like the screenshot below shows:
With the JSON file added, open the Boards Manager, search for "STM32duino" and install the latest version. Once that finishes installing, check to make sure the MicroMod STM32WB5MMG option appears in the "Boards" menu by navigating to Tools > Board: > STM32 MCU Based Boards > SparkFun Boards>.