Go to Github page and download the code for Multi-Control, and unzip it. Then get into the folder: SunFounder_Multi_Control\multi-control-keyboard to run multi-control-keyboard.ino.

In the Arduino IDE, click keymap.h to modify the key values of the ten buttons. Here I define them according to the pin’s position on the board (designed previously and will be marked later).

Then select the board type (Leonardo) and port, and upload the code.