I am trying to add content to the checkout page. I have read through a large number of WPMUDev support threads with people wanting support for the same thing. One solution said that you just edit the pro-sites page and it will be added to the checkout page. I have tried this, but it only shows up when viewing http://whosdevelopingnow.com/pro-site/ but not when you get to http://whosdevelopingnow.com/pro-site/?bid=2
Once you select a site to upgrade, the content updates to the page disappear. How do I edit the checkout page where the plans are shown?
The screen shots attached show the two pages. The seagull image was added to the pro-site page content, so you can see my dilemma.