You can change your organization details on your Heficed Terminal: https://terminal.heficed.com/organization
In the following link, you will find your company details, and you can edit all of the account information by pressing 3 dots -> Edit.
Here you can change all the information:
If you want to change your login username (email address with which you login to terminal) or just add another user to your organization, you need to create new account with your new email address: https://login.heficed.com/register
After that, login with your old email address (https://login.heficed.com/login) and go to Main Menu tab -> IAM & Security -> Users & Roles.
In new page, you need to add your new email address to the list and set "Owner" permissions. As provided in the example, press "Add", then type your new email address and select new role "Owner":
After that you can login to your Terminal with your new email address and you will see all your services.