Locating your MailChimp form action URL is pretty simple. Please follow the steps below and if you run into any issues let us know or submit a help request to MailChimp and they’ll help you get the correct URL to use.
Step: 01 Login into your MailChimp account and click on the Audience from the top menu. Create a mailing list for the people to sign up if you haven’t already.
Step: 02 Go to your Signup Forms or Lists
Step: 03 Click on the right down arrow (along with the Stats) of your selected List to see options dropdown.
Step: 04 Click on the Embedded forms link from the list of form types.
Step: 05 Then the Embedded Form code will appear. Look for the action keyword in the form code. This is the Action URL that you are looking for. Copy the action URL from there. Please have a look at the screenshot below.