How to Create Custom Fields in MailChimp

Navigate to the Lists page and click the drop-down menu next to the list you want to work with and choose 'Signup forms':

Then, select 'Form builder':

Navigate to the Build it tab and under 'Add a Field', click 'Text' to add a new text field:

Make the field label 'deadlinetext', select 'Hidden' for field visibility, and add 'deadlinetext' to the Default merge tag value, then click 'Save field':

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