Any user with access to a workspace, including portal Administrators, can add or remove other users.
Access to a workspace can be modified after the Workspace has been created. Any user who already has access can make these changes, as well as portal Administrators can add or remove users to the access list.
Users can make these changes in two different places.
The Workspace List
On the main Workspace list page of the portal, find the workspace you want to change and click the Manage User Access button.
On the Update Workspace Users dialog, update who has access to the workspace using the checkbox next to their name. After you've finished your changes, press Done to save your changes.
Workspace Details View
If you are already inside the Workspace details view, click on the Workspace Access tab.
On the Access tab, update who has access to the workspace using the checkbox next to their name. After you've finished your changes, press Save changes.