Account and Event Administrators can add Session Chairs and Locations within the  Online Conference Program Builder, which then become selectable when creating/managing sessions.

Manage Locations

Click 'Manage Locations' in the Program Builder then click 'Add New Location'.

Enter the location name then click 'Save'

Manage Chairs

Click 'Manage Chairs' in the Program Builder then click 'Add New Chair.

Enter the Chair's name then click 'Save'

Selecting Locations and Chairs within a Session

All locations and Chairs added will be selectable in the relevant fields by clicking the dropdown arrows within the 'New Session' or 'Edit Session' screen.  See also Setting Up Your Online Program