If you already have the user's details (eg. first name, last name, email) you can pre-populate the Form Widget for them so they don't have to fill-in their details again.
That way, when your users get to that page, the Form Widget will be pre-populated for them and it will be faster for them to join the campaign.
Extra: Capturing the details from the URL
In the case where you have the details available through URL parameters,
eg. from clicking a link in one of your transactional emails, like:
you can use this script to pre-populate the data in the Form Widget.
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