MetaMask is a bridge that allows one to visit the
distributed web of Ethereum in the browser. It allows anyone to run
Ethereum dApps right in browser without running a full Ethereum
node.MetaMask includes a secure identity vault, providing a user
interface to manage your identities on different sites and sign
blockchain transactions.Below screen shots are self explanatory for installation of MetaMask in chrome browser.
Goto the extension link at google chrome store at https://chrome.google.com/webstore/category/extensions
Search for MetaMaskAdd the extension as seen in the screen shot below
Welcome screen of MetaMask
Create your Password
Click accept
Download your phrase and store it as deemed appropriate secret location,duly encrypted ...since this single phrase will be the key to fiddle with your ethers ahead
Installation part complete