thank you for the nice help! I am now using contact form 7 and adwords and analytics tracking is working perfect!

I’m not that good in coding. But as I understood I need to put the Code from Google somewhere into a file. I did not really understood where to paste the code so that it is called after pressing the submit button. Do you have a hint for me where to paste it in which file?

The code looks like:

<!-- Google Code for website | Contact Form Conversion Page -->
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = 12345678910;
var google_conversion_language = "en";
var google_conversion_format = "3";
var google_conversion_color = "ffffff";
var google_conversion_label = "RLtFCOHMyQcQr7Op0QM";
var google_conversion_value = 0;
var google_remarketing_only = false;
/* ]]> */
</script>
<script type="text/javascript" src="//www.googleadservices.com/pagead/conversion.js">
</script>
<noscript>
<div style="display:inline;">
<img height="1" width="1" style="border-style:none;" alt="" src="//www.googleadservices.com/pagead/conversion/975854099/?value=0&label=RLtFCOHMyQcQr7Op0QM&guid=ON&script=0"/>
</div>
</noscript>