After you have created your webinar, you can update your theme in two places.
1. On the Design tab of your webinar page:
Scroll to the bottom of the design tab, and edit your theme. It will automatically save your changes.
You are able to update the logo and the theme color (all the way down to your preferred Hex color code).
Note: if you save the theme as the default, all future events in this channel will use this theme.
2. Inside the live webinar room:
When your webinar is in progress, scroll your cursor over the logo in the upper left hand corner.
Click EDIT THEME.
Then edit your theme.