To edit the submit page template you need to start with libs/front_end_submission.php .Each section of the page has a special file that can be found in templates/submit_templates
By default all fileds from submission page are filtred for html. If you want to allow html you need to make a new “$allowed_html” array for wp_kses instruction
$property_address = wp_kses( $_POST[‘property_address’],$allowed_html);
you need to make a new “html” array that will set what html tags can be submited.
Before starting read this page http://codex.wordpress.org/Function_Reference/wp_kses