Follow these steps as a hub administrator to invite members of your organization to a hub.
At the top left of the Fusion window, make sure you are working in the correct hub.
Beside the hub name, click More .
From the drop-down menu, select Team Settings.
The Team Settings tab opens in the Fusion web client. If this is the first time opening the Fusion web client, you will see some introductory messages, which you can read and dismiss.
Click the Members and Roles tab.
You should see your name listed as an administrator here.
Click Invite.
In the dialog that opens, enter the email addresses of people you want to invite.
Separate multiple entries with commas.
In the Invite dialog, when you have finished entering addresses, click Invite to send the invitations.
Inside the Members and Roles tab, click the Sent Invitations tab to see the list of people you have invited.
You can now start assigning Fusion licenses to the people you have invited.
For more information on setting up Fusion hubs, see this Autodesk blog post.