PenTest.WS supports Two-Factor Authentication and can to be enabled per-account. You'll need a third-party authenticator app such as Google Authenticator:
Enter the One-Time Password to confirm everything is setup correctly
Click
2FA Backup Codes
Once you have enabled Two-Factor Authentication for you account you'll be provided 2FA Backup Codes. Be sure to write these down, download them or print them out, and don't lose them. They are required if you lose control of your authenticator app.
Settings - 2FA - Codes Show
2FA Login
When logging into an account with 2FA enabled, you'll be presented with a Two-Factor Authentication prompt. Open your authenticator app and enter the one-time password.
2FA Login
2FA Backup Code Login
If you need to use a backup code to login, click the "Use A Backup Code" link and enter one of your ten backup codes. Once you have used a code and logged in, it will no longer be available to use again.
Login with Backup Code
Tier Availability
Two-Factor Authentication is available on all tiers.