If you have not registered for the ICO and whitelisted your ETH address, visit https://verify.holo.host.
Step 1: Visit the MetaMask website to install MetaMask. It will install as a browser extension to your Google Chrome, Firefox, or Opera browser.
Installing MetaMask on Chrome looks like this
Step 3: Import your whitelisted account
You now have your whitelisted address imported into MetaMask! This will allow you to send ETH to our ICO more easily because MetaMask can connect with our ICO site and generate a transaction for you.