Change slideshow into RSS feed

Hello,

I’m working on my 1st WP website and I’d like to have some help. I’ve bought an excellent theme but I need to swap the homepage slider with a feed from a URL. I’m just not really sure where I should go and have a look to do this if it has to be done manually on the code.

On the other hand I’d like to know if there’s a plugin that allows me to do this.

Please have a look at the website here

http://www.newtreedesign.com/wjreid.com/

Basically the slideshow (stuck at the moment!) just below the top menu should be swapped with the list of properties coming from this URL

http://www.espc.com/EspcServices/CustomSearchView.aspx?SearchCriteriaFile=WJReid.xml&XslFile=WJReid.xsl&CssFile=Screen.css&DescendSort=True

Could please anyone give me a little help on this?

Thank you
Paolo