You can check if your organisation already has access to the Altmetric Explorer directly from the Explorer login page.

The Altmetric Explorer login/registration system will automatically attempt to determine which organisation you belong to based on the domain of your organisational email address.

If you are eligible for the Altmetric Explorer, the system will send you an invite with a registration link and will allow you to create an account straight away. In other cases, you will receive an email with further instructions.