Google Adwords Conversion Tracking

Google Adwords Conversion Tracking

I'm trying to add conversion tracking to my Adwords campaign.  I have been unable to add the Google language as an action upon success.  Is there a trick?  

Also, if it's possible to push everyone to a "thank you" page after they sign up that might provide an easier method to add the conversion tracking code.  I haven't figured out how to add a page to the site without it populating in the navigation bar.  If there's a way to do that it might just solve the problem.  Thanks in advance.