You can choose your own custom username on the initial sign-up page when registering for your Business Profiles account.
Please note: If you would like to use a new username you will need to create a new Business Profiles. You can use the different email as long as the username is different.
If you have any questions, please contact our customer support team via this form, or emailing support@businessprofiles.link
No, you can create other accounts with different emails
You can certainly have more than one Businessprofiles registered to a different email address!