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
URL to your Form
Screnshot: Settings tab
Screnshot: Merge Fields
Please leave this field empty.
Contact form 7 Mailchimp extension by Renzo Johnson - Web Developer