Is there a way to put an image in the center of the virtual tour, I would like to use this as a watermark so I can give it to my client to see.
Please let me know.
Do you mean a watermark to protect your panos from being copied or do you mean placing a logo in the images?
the first item you best do in Photoshop by placing a watermarl in your equirectangular image. This one definitely is not removable.
in the second case you need to make a logo as png, place it in your "data-->>graphics" folder and add the line in yout basic-xml: <plugin name="logo" url="xxx/graphics/logo.png" keep="true" align="rightbottom" x="9" y="9" onclick="openurl(http://www.xxx.com,_blank)"/>