Over to the left, it says "html allowed". That means if you paste HTML code into a post, our browser will try to interpret it -- but Bravenet's software will filter some of it out, because it could cause problems. That feature is so you can place links in your message, or include small images.
If you want to paste HTML code in, you need to do the same thing you would do if you wanted the code to appear on your page: change < into <, for example.
But pasting all your code into a post here isn't going to get you an answer. You need to place the code in a page on your site, and post the URL of that page.