First you need to decide if you would like this to be on your master map under “My Venues” or a map on a particular event. If you edit the master map, all future events that are not currently using it will have the changes. If you edit a map on “My Events”, only that map will have the changes.
To change this on “My Venues”, click on the “Edit” button. To change this on an active map go to “My Events” then click on “Venue” to the right of your event listing.
In the seating map editor, on the left side you will see and “Upload Image” button. Supported file formats are PNG, JPG, and GIF.