Once you are in in your mailing list view, click on ‘(change name/type)’
Then you will be presented with the mailing list settings and you will find the List ID at the bottom of the screen:
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Make a Donation
Your Name (required)
URL to your Form (required)
Your Email (required)
Screenshot: Settings tab (required)
Screenshot: Merge Fields (required)
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*** Please note: All fields are required ***
Contact form 7 Mailchimp extension by Renzo Johnson - Web Developer