how to add an iframe widget via code

I am totally new to blogging and am clueless about coding, so forgive me if this seems an obvious post...

I am trying to add the code for an iframe widget to my homepage (not all pages). Since I have no idea how to code, I have no idea where to put the widget code so it is visible. I tried entering it into the Widget Content Box, but nothing appeared on the page. Can someone help direct me on what I need to do?

The code is: <iframe frameborder="0" scrolling="no" src="http://www.urbanspoon.com/b/posts_map/17/3579/Denver-restaurants" style="width: 200px; height: 200px; border: 2px solid #003399; background: #eee"></iframe>

And my page URL is: www.pickypatron.com

Please help!