The whiteboard feature is a great way to display any information you'd like to guests at the event you're sponsoring!
To open up the whiteboard, click the 'More' button in the bottom menu toolbar and then select 'Whiteboard'
If you are using the Miro Whiteboard, the images may look a little different, but the core functionality remains the same. Please check out this article for Miro Whiteboards specific features
Here are a few ideas you could try using the whiteboard:
And here's an example of a whiteboard for a Sponsored Booth: