Vitari is a self hosted system (on premise) you will need to contact your system administrator for the required credentials.
They will need to:
Make sure the system is open to the internet and provide the Domain to access.
Provide GUID and Client ID
Enter the following values:
Domain: The domain provided by system admin.
Client ID: The Client ID provided by system admin.
GUID: Provided by system Admin
Your connector is now setup!