To view Sion host agencies connected to your account, you need to be an admin user. Not all accounts have host agencies, generally only independent contractors will need this feature.
To view your host agencies, click your username in the top right of Sion. In the dropdown, select Account Settings.
This opens the general Settings page. In the left menu, click Host Agencies. The Host Agencies page will open.
Any host agency that sent you an invite in Sion will appear on the page. If you click on a host agency, the Edit Contractor window will open.
As a contractor, you can edit the permissions that host agencies have with your data. Click the Host Access tab to adjust permissions for the host agency.
The rest of the information in the Edit Contractor window is just a record of the agreement you accepted when the host agency invited you to use their identifiers.
When you’re done click Save Changes.