Firstly, you need to access to Mailchimp signup form
Then on the Designer page, select a field,
The element’s settings will appear on the right, you can see Field Tag here
When you got the field tags, fill the corresponding Mailchimp Field tags in pifyapp Form Elements.
Note: With group ADDRESS tag
As you see, there are 6 input properties below but they are grouped in only one tag as ADDRESS
This is an example of an expected result when creating Mailchimp subscribe form.
If you are using the Address Widget in your form. The Mailchimp Field tag could be ADDRESS.