Brevo integration help 😭

Hi guys! Wondering if anyone can help me with strategies of what the heck to do here…

I’ve built my site on squarespace and have a newsletter sign up box. I plan to use Brevo for all my email marketing.

I made a welcome email in Brevo and am STRUGGLING to learn how to connect it to the Squarespace.

Is there a way to do it without using a third party? It seems like such a simple task. I made a Zapier account but could not for the life of me figure out how to do the automations. For example it asks for recipient details but like.. it’s dependant on the new subscriber? 😭

Any tips or tricks would be so helpful. Thank you everyone!