In reply to Louise.

Hi,

When using MailPoet, leave all those fields blank. The form action, email field name, first and last name field names aren't used: https://cloudup.com/cJXDk0Gr-I3

If you're still having issues, please start a thread on the widget's support page and include a link to the site with the widget enabled. http://wordpress.org/support/plugin/genesis-enews-extended