Visit the official download page on Metamask.io Select your browser and you will be redirected to the Chrome web store or Firefox add-on site. Click on the button to add the extension to your browser. After reading and accepting the privacy policy, Metamask automatically creates a new Ethereum address and asks you for a password to protect your account. This password cannot be recovered in any way so keep it carefully. At this point you can choose whether to add an existing wallet or create a new wallet. If you need to import an existing wallet, just enter the CID, which is a sequence of 12 Seed Phrases, i.e. keywords to be noted when creating the wallet because they will be used to install it on another device. If you need to create a new wallet, you will need to click on “Create new wallet”, choose an access password and save the 12 recovery words. Finally to find your wallet address, click on the 3 dots on the right side of your account and click on “Copy address to clipboard”.