email subscription button not linked to Mailchimp anymore

Hello,

I recently used a template that had a working subscribe button that I connected to Mailchimp. When people subscribed I received notifications in my Gmail account and the subscribers were added to Mailchimp. However, I duplicated the section and made some changes to the copy, and then deleted the original section. Now, the subscription button is not working as before—I don't see an option to use Mailchimp as storage and I'm only getting Gmail notifications with no updates in Mailchimp for new subscribers.

I would appreciate any help in resolving this issue. Let me know if you need any additional information.

Thank you!