1. Download the Excel file here & fill out all the yellow mandatory details.
2. Go to Attendees in NetworkTables and click on Import from Excel
3. Choose your file
4. Check if all columns are matched right > match the unmatched columns and click Complete Import
5. Check the session in 'Preview' (right top of page, attendee view) and see if the co-host has a same colored circle and is mentioned as co-host in the session description.