The document provides step‑by‑step instructions for using the function keys on the Lenovo Commercial 2121 keyboard, including how to select predefined schemes such as WPS, multimedia, and custom layouts. It also describes how to modify individual key functions and save the changes.
Additional sections cover how to cancel custom assignments, restore default settings, and exit the configuration mode safely. The guide is written in Chinese and includes screenshots of the on‑screen menus.