Kindly have a look at the link stated below.
https://www.bitdefender.com/consumer/support/answer/2076/
If the issue persists, kindly contact Bitdefender support by visiting https://www.bitdefender.com/consumer/support/help/
Select, How to's & Troubleshooting Bitdefender products→Troubleshooting→I don't know→Contact Support→ You will get the option of chat, call or email.
To get an immediate update, kindly use the chat option. Also, ensure that no ad blockers or privacy extensions are enabled in your web browser, as they may prevent the chat window from appearing.
Regards
Hi,
If you forget the password for your Bitdefender settings, you will need to reinstall Bitdefender or contact Support for assistance.