Adding Carfax

[autoplexlistings]

I am wanting to add carfax to my auto site. I have been given this code to add in. However I can not work out where to put it, or how to get a vin number that users put into catagories to show up in there. Any suggestions.

A href="http://www.carfax.com/cfm/check_order.cfm?partner=KOW_D&AffiliateID=3579&BannerName=flat_88x31_ybkg11.gif">
<img src="http://www.carfax.com/img_myap/flat_88x31_ybkg11.gif" border=0></a>
<img src="http://affiliate.carfax.com/showban.asp?id=3579&BannerName=flat_88x31_ybkg11.gif" border=0>