Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
After signing up with Rank Math, you should be able to receive an email containing your username and password.
You can request a password reset link by going to https://rankmath.com/my-account/, and click on forgot password.

On the next page, enter the registered email and click on reset password.
You will receive the password reset link in your email.
If you are still having issues changing your password, let us know here and we will assist you further.
Looking forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.