There are 2 ways (methods) of creating your account on Billo:
Using your email + password.
Using your Google account.
Depending on the method you've chosen to sign up, you should use the same method to login.
Most likely, if you do not receive a password reset email, you need to try clicking on "Sign in with Google".
If it doesn't help, please let our Customer Success team know about it and we'll solve this issue as soon as possible!