In the PowerBIConnector.nl portal, you configure the Fabric connection with Exact Online. You can access this portal at https://portal.powerbiconnector.nl.
As an administrator, you can define which users have access to which administrations. As a user, you create the connection with Exact Online here and retrieve the Connector Key that is used in Fabric.
When activating your company account on PowerBIConnector.nl, you received an activation email. This email contains your username and the steps to activate your account. The first user is automatically the administrator of the company account.