Create a PINTEREST EVENT CODE for my website

Site URL: http://www.somewherecrazy.com

Hello!

I would like to create some ads on Pinterest and I am trying to do things right step by step. 

I believe I have successfully installed my Pinterest BASE CODE in my Squarespace website (in Settings>Advanced>Code Injection>Header - changing YourTagID with my tracking code). 

I would like now to add an EVENT CODE... and I am lost. My goal is that my website visitors actually sign up to the contact form on my website. There are several contact forms around the website - the main one in the Contact Page but also in some other pages. 

So what should I do?

In Squarespace in Settings > Advanced > Inject Code there is a space for ORDER CONFIRMATION PAGE. Is it where I have to paste my event code? 

And also which event code should I paste? 

Is it this one?

<script>
 pintrk('track', 'signup', {
   lead_type: 'New release promotion'
 });
</script> 

or this one?

<script>
 pintrk('track', 'lead', {
   lead_type: 'Newsletter'
 });
</script>

Do I need to change part of the code? the part where it's written 'New release promotion' or 'Newsletter'? I guess I should change it with Contact Form but to which contact forms of the many will it refer to? I need to know what's the coding name of the contact forms... how can I know it?