Can't change the PRO-SITES sales page?

Hey guys,

I am not a techie, so here it goes:

The blogging network is set up and the pro-sites plugin is set up too.

The checkout page appeared on the main site too (see picture). Prices reflect which is good. But I can't change anything else. I go to the actual page to edit (see picture) but it's empty. So how do I change it? I want to add (the packages in Bulgarian, sales video above them, and a chart below like edublogs about what features different levels have)

Can you guys help me add these 3 things. I would be so so grateful!

P.S. I don't see an option to upload the pics with editing this post.