We want to add a membership renewal form that our members need to sign every year to our Wordpress website. When a member enters an existing email (they are already in Constant Contact) will the form pre-populate? If not, what happens when the member fills out the form again with the same information? Will the new date that the form is filled appear in the appropriate CC field?
To find out if the WordPress form will dynamically populate the existing contact information into the form after the email is added to it, you would need to contact WordPress directly to confirm.
Either way, once the information is filled out in the form and it is submitted, the information will be considered an update for any existing contact. This will overwrite the old information with the current information from the form.