When you want to trigger a tag upon form submission in GTM and you are installing GTM on your Unbounce page using Script Manager, you could set up a custom event using gtm.formSubmit event. Follow our documentation: How Do I Integrate Google Tag Manager With Unbounce?
In the case where you have GTM installed manually, on the variant level, you would need to set up your triggers configuration as the default Form Submission in GTM as you can see below:
This is of great interest. I current;ly have a database name, email address, telephone number etc
I currently use MailChimp to send out my email. What I wont to do is prefill the form on your landing page with the data I have
We did set up the GA script, so it sounds like we should be okay.
Sue
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