HubSpot form integration - Adding classes to buttons to create a popup form

Hello dear code specialista!

I got into a tricky situation as my client wants to add pop-up forms from HubSpot to Squarespace. Normal forms work fine, but to add this feature its says: ad the following classes to a button on your external website to trigger your CTA

Then there is a line to copy: hs-cta-trigger-button hs-cta-trigger-button-88209495543

Is this possible to do in Squarespace, how? Anyone has any idea of experience on this?

Thank you! 

Kalle

You probably need to code the button rather than use an existing button. I would suggest copying the HTML code from inside Chrome dev console, and then adjusting it, adding that class, and putting it in a code block.