You can add multiple email addresses to an existing Refundid account however, every user can only have one account.
In order to add another email address to your account you will need to Log in to your Refundid account, click on the three-line menu at the top right corner, and open the 'My account' page.
Click the 'Add Email' button in the 'Your details' section and progress through the email verification process in order to connect the additional email to your Refundid account. This will then allow you to lodge future returns using the newly added email address.