Your organizational dashboard: what can you do with it?
On the most basic level, it's a way at a quick glance to keep track of and manage access you've granted to people to participate in your private blockchain network.
In your dashboard, you can see everyone who's been invited, whether or not they've accepted and confirmed the invitation.
You can edit each user, changing their role, (contributor or Admin), set a limit if you require, to the number of nodes they can add, or remove them from your network.
You can also, of course, add more members by sending out the organization invite email (the green <add user> button at upper right.