I'm using Wordpress (Thrive Architect's form) to subscribe people. How do I setup double optin for this?

I'm using Wordpress (Thrive Architect's form) to subscribe people. How do I setup double optin for this?

Do I need to setup an automation manually to start the double optin process? Or will it happen automatically?

I am NOT using the Zoho form. I am using Wordpress> Thrive Architect's form.