As i know go to the official MetaMask website. You can find it by searching "MetaMask Wallet" or by visiting metamask.io. On the MetaMask website, you should see a prominent "Get MetaMask" or "Download" button. Click on it. You will be directed to the browser extension store, such as the Chrome Web Store or Firefox Add-Ons. Click on the "Add to Chrome" or "Add to Firefox" button, depending on your browser. A confirmation pop-up may appear asking for permission to add the extension. Review the requested permissions and click "Add Extension" or "Install," as applicable. The MetaMask Wallet Extension will begin downloading and installing on your browser. Once the installation is complete, you should see the MetaMask icon in your browser's toolbar.