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How can I open a ConvertFlow pop-up when a button is clicked on my site?

Hi … Convertflow help says I have to add a trigger class to the button.
I have the convertflow code added to the site , so the pop ups works as expected ( after some time or scroll % , exit intent …) but the option i need ( upon click an element) requires this adding of a class to an HTML element … and there I get lost

the class looks like this; cta-66469-trigger
but where i have to add it ?

( I tried as a "normal " css class and as a custom attribute … but it does not seem to work … any suggestion ?
Thanks a lot


Here is my site Read-Only: https://preview.webflow.com/preview/jorges-fantastic-project-0fd1c2?utm_medium=preview_link&utm_source=dashboard&utm_content=jorges-fantastic-project-0fd1c2&preview=9f320c40279778c0e31f67e07209d895&mode=preview