1. Click on the 'Contact Lists' tab and then click on 'View Custom Fields':
2. Click on 'Create a Custom Field':
3. Select 'Text Field' for the Custom Field Type and enter 'deadlinetext' in the Custom Field Name, then click 'Next':
4. Ignore the Custom Field Details and click 'Next':
5. Select the list(s) for the custom field to be added to and click ‘Save':
If you have any questions, please let us know at email@example.com.