Hi@Vicki L,
Thanks for sharing your question with us!
While neither Community nor Support can help troubleshooting this for you as triggering a legacy popup when you click a button requires custom coding, our documentation mentions adding this smaller bit of code below your form’s HTML code. This code, that triggers when you press the button and should be below your large chunk of form code should look like our Help Center documentation's example here:
<script type="text/javascript" src="//www.klaviyo.com/media/js/public/klaviyo_subscribe.js"></script>
<button onclick="KlaviyoSubscribe.attachToModalForm('#k_id_modal',{delay_seconds: 0.01, hide_form_on_success: true, ignore_cookie: true, success_message: false});">Click me</button>
I’d suggest checking out these similar conversations to gain more insight or reaching out to a Partner to help build this out for you.
Thanks for participating in the Community!
-Taylor