Did you know you can access all of your accounts with one email address?
Follow these steps to set it up :
Log in to your second account using the original login details (email address and password used to create the account)
Create an employee with your details - including the email you want to primarily use
Change access level to Administrator
Repeat steps for every additional account.
Next time you log in using your preferred login details you'll be able to switch between accounts by clicking on the drop down menu located on the top right.
Administrators and Owners have the same access level so your access remains the same.