Paano mag-install ng smart switch sa existing ordinary 3 gang switch? tagalog electrical tutorial HD

Diagram: https://drive.google.com/file/d/19zxfVZ_S1FlH5k7U80ES3q_wuCCeUU7M/view?usp=sharing product link: https: https://shopee.ph/SMATRUL-Touch-switch-light-wall-light-switch-86-type-1-2-3gang-black-white-tempered-glass-panel-110-240V(No-need-neutral-line)-i.88411661.7850410024?position=5