Adding a custom message on Payment Page

I wanted to add a message in the payment page. I thought I just had to edit the page and enter text into the content WYSIWYG form, however none of that content shows up. So how do you suggest I add content the payment page and have it be shown under Checkout with paypal?

I also do not see that payment page as a page in my superadmin blog "see all pages" list.

Maybe this can be a future feature request... to allow custom messages be displayed on that page?

An added cherry would also be something to make it easier to modify css on that page.

Thank you!