1. Head to metamask.io and download the suitable extension for your browser: 
  2. Install downloaded package. Restart your browser. MetaMask icon should appear at the extensions bar. Click on this icon.
  3. On the new panel press "Continue". Enter your new password and press "Next".
  4. Accept the terms of usage. After that click the button below to reveal the secret phrase. Write it somewhere safe, press "Next" after that.
  5. Confirm your Secret Backup Phrase.
  6. Congratulations, the address was successfully registered. Now you can see your public address - 0x...