Adding form tag causes ” /> error on top of the web page

Hell Team-

Thank you for the awesome plugin. We really enjoy using this.
Recently, i have added modified the “Template Content” to hold html tags as well.
Template Content:
——
[Subhead]
type = textarea
rows=10
cols =35
htmlEditor = true
————-

I am trying to add <iframe> tag in the short description of to display in the blogs list page with iframe player. When i add <iframe> or any tags like it shows -” />- (enclosed by hypen). on the top of the post detail page.
Someone to help to have <iframe> and other tags without having this issue?
It shows error in RSS feed.