Adding Polygon support to your wallet involves adding some network details to the extension. First, open MetaMask App. Select the hamburger menu (three stacked lines) on the top left of your screen. Click the Settings button. Select the Networks option. Now, choose Add Network on the end of list. You’ll need to add the following details on the New RPC Network that will open. Network Name: Polygon RPC URL: https://polygon-rpc.com Chain ID: 137 Symbol: MATIC Block Explorer URL: https://polygonscan.com Click Add when you’re finished. You can follow the tutorial video below, video is in Bahasa Malaysia.