google conversion tracking issue

Hi I'm relatively new to rails. I want to place conversion tracking code on a site, on the confirmation page for signups and sales. I have separate code for each type of conversion, but I cant figure out how to place it so it works. The same page is used for signups and sales, using conditional statements to determine whether it displays confirmation about a signup or a sale. I tried putting the code in the conditional statements, so that it would track the right thing. I was able to try test conversions for signups, and when I viewed the source, i saw the code snippet, but it didnt display the google stats text box thing that is supposed to be displayed on the confirmation page. Also, no conversions ever showed up in the adwords report. It stayed at 0. I think I must have placed the code in the wrong place. I read on google that it needs to be placed in a portion of the page with static html, but the page is dynamic, and it depends on which activity you are doing what it displays on the page. I would greatly appreciate your help. Thanks

U don't have modify any code in rails. I have installed restful auth
plugin so I know users who complete the signip process will go to / users URL. I have setup a daily report via google analytics that
isvsent via email. It shows me the percentage of users who reach that
page. So I know the conversion rate is very close to that figure.