As an admin user in wallee, you may want to give access to your account to other staff members. To this end, you have the possibility to create human users and eventually assign roles and permissions to those users.
Make sure that you always add the corresponding READ Access to the Space and Account level. So the users need at least to have read rights to space or accounts.
In case you do not apply roles and permissions to those users correctly, they will not be able to access your account and will get instead an Error page 'Access Denied - Error code: 403'.