To use the proof of concept feature now, sign into your account on 1Password.com and click Open Vault. Click on an item in the vault, then Shift-Control-Option-C or Shift+Ctrl+Alt+C depending on your operating system. That unlocks the proof of concept and allows you to click the "Check Password" button next to your password. You can see in the video below what happens next. If your password matches one in Pwned Passwords, 1Password will let you know. If it doesn't, 1Password will tell that you're all good. We want to note that if your password matches one in the database, it doesn't necessarily mean it was part of a data breach. Someone else could've been using your same password, but in either case, you should change it.