the page in your link does not appear to be a form builder for?
can you send a copy of the page in a zip archive so i can see the code to determine what is causing the problems.
To edit a form after creating it, click on the blue bounding box that surrounds the form in design view. See the getting started guide -> Reentering the interfaces section for more details:
To change the look of the submit button, click on the edit css button in form builder. Select the buttons category from the initial select list, this will allow you to set all of the options for the look of the buttons.