Now I tested your plugin and there's a lot of what goes wrong. I used the FAST SECURE CONTACT FORM plugin within the box of your plugin and the automated forwarding to the defined URL doesn't work. I get the Email of the form but the page stays as before.
A lot of popups for text formatting won't work in your box.
If you take a look to my landing page I used
h1, h2, h3... tags to get space between text blocks. This is very tricky to do on this way. Please make your box similar to editing pages or posts - thank you!
Thank you for support!