The following playlist will help you to negative via the ETS interface.
Chapter.1 - Back-office Access
Chapter.2 - User Management
Chapter.3. - Back-Office Sales (Box Office/Concierge/Contact Centre/OTA)
Chapter.4 - Basic Event Setup
Chapter.5 - Advanced Event Setup
Chapter.6 - Reporting
Chapter.7 - Travel Agency (OTA) Management
Chapter.9 - Finance
Chapter.10 - Admission
https://www.youtube.com/playlist?list=PL7tc4uLhzWJtFzSx4KTfV9beTE6CoU-k2