Custom integration do not work

[ad_1]

Hello.
I trying to add subscription checkbox to the popup form.
It is simple HTML form generated from Salesforce (if it is important).

I set up custom integration in plugin settings according to instruction and added custom field to the form.

Plugin is associated with Mailchimp. And I cand some subscriber were added via CF7 integration.

But for some reason it does not work for custom integration.
Can you please help me to make it work?

<input type="checkbox" name="mc4wp-subscribe" value="1" /> Sign me up for the newsletter!

The page I need help with: [log in to see the link]

 

This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer