This link directs you to the two-step verification process; we'll also walk you through how to set it up.
To set up two-step verification, follow the steps below:
Step 1: Click on your username in the top right corner and click on 'Password and security':
Step 2: You will be taken to this screen, where you can click 'Enable' to set up verification via an app:
Step 3: You will be prompted to confirm your password. Enter your password and click 'Confirm':
Step 4: You will then be taken to a screen with a QR code:
Step 5: Use Authy or Google Authenticator (or equivalent) to scan the QR code. The app will then generate a verification code that you will need to type into the box at the bottom. Then click 'Confirm.'
You will be taken back to this screen, where you can now enable email confirmation.
You will then be taken to this screen:
Step 6: Enter the code that is emailed to you and click 'Confirm'.
Finally, we recommend you copy your backup codes, just in case you lose access to your phone or authenticator app. When you are taken back to this screen, click 'Manage' and save your backup codes somewhere safe.
Should you ever lose access to your account entirely, you can contact Support. We'll need to run through an account recovery process and verify your request. Once we have confirmed that you are the account owner, we will help you regain access.
Related BHW thread How to: use two-step verification (2fa) | BlackHatWorld