On the layout tab, in the Screen Controls tab, Click on properties. that will bring up the Screen Properties Dialogue box. Under Built in screens, you can select the seating chart. From there, click on Edit Table Images, under the format section. From there, you can enter in the path to the image you want to use. If it's a background image you're looking to do, then click on the area inside the box in the background area, instead of clicking on edit table images. I believe that with the table images, you can have different images showing to replicate what your tables actually look like at your event, but I've not tried to do that yet.