Here's how you may find Mailchimp URL to use in EasyBox app subscription widget.
STEP 1 of 9 Log in to your MailChimp account and go to Lists:

Step 2 of 9: Please click the “Create List” button and create a mailing list for people to sign up for:

Step 3 of 9: Proceed with the creation:
You’ll see the form:
Step 4 of 9: Fill all the required fields and save the changes:
Now the List was created:
Step 5 of 9: In this step, you need to click “Signup forms” menu item:

You’ll be redirected to the following page:
Step 6 of 9: Select the “Embedded forms” option:
