Insert Adwords Code in Send-Button

Hi there. I want to insert the following code into my website’s sending button:

<a onclick=”goog_report_conversion (‘http://ihrebeispielurl.de/ihr-link&#8217;)”
href=”http://ihrebeispielurl.de/ihr-link”>Jetzt herunterladen!

Here is the code from the website’s form:

<h2 class='av-special-heading-tag'  itemprop="headline"  >Test<span
class='special_amp'>&</span> Test</h2>
[av_contact email=' (Email address hidden if logged out) ' title='' button='Send' on_send='' sent='Thank you.' link='manually,http://' subject='' autorespond='' captcha='' form_align='' color='av-custom-form-color av-light-form']
[av_contact_field label='Name' type='text' options='' multi_select='' av_contact_preselect='' check='is_empty' width=''][/av_contact_field]
[av_contact_field label='E-Mail' type='text' options='' multi_select='' av_contact_preselect='' check='is_email' width=''][/av_contact_field]
[av_contact_field label='Nachricht' type='textarea' options='' multi_select='' av_contact_preselect='' check='is_empty' width=''][/av_contact_field]
[/av_contact]

I really don’t know how to insert the Google code because there is no regular tag. I really appreciate any help.

Greetings