From the Manage Account tab, you will be able to manage who has access to your Sellics account, and which modules they can utilize.
When you are set as Account Admin, you have permission to add and delete users (to delete a fellow admin, you need to first remove their Admin access). You can also edit the permission of each user to access different modules, markets, and tags.
Only the original account admin can add another user as admin of the account.
Lastly, from manage account, you can also update your password to access your account.