Check the official website or download portal provided by the vendor where you purchased the keyboard (e.g., Amazon listing documentation, Epomaker, or specialized budget peripheral forums).
While the hotkeys are great, the software unlocks the "Pro" features of this budget beast: Macro Recording ziyoulang k87 software
Ensure the keyboard is in wired mode if you own a dual-mode/triple-mode variant. Check the official website or download portal provided