My subscriber card pops up whenever you click on any of the places to sign up. However, it does not allow entries. If you put in information, you get a spinning whele and failed attempt error message.
I do not have an email service or strip setup, but I figure it would allow you to create a list of users by signing up.
You do need to have email configured for the sign up to work correctly.
This is because a member will only be added to your site after confirming their email. This helps fight spam and ensures that users are opting in.
If you’re just looking to collect sign ups and don’t want to configure email, then you could look at using a form service like Google Forms or Formspree.