Deborah on "How to add a custom widget to my WP site"

Hi
I've been given the following link to add a custom built widget to my site (its a currency converter) and I've been told I can just paste this into my site and the widget will show.

http://partners.moneycorp.com/converterpio/?rp=10506843

As I suspected, just pasting this link doesn't work, so do I past the HTML code and then add the relevant CSS coding, should I go back to the developers for more information, or is there something else I should be doing?

I can do reasonable CSS and html code but when it comes to PHP I'm really limited.

Thanks