Thanks for reaching out in the Community regarding your WordPress plugin issue. I am sorry you're having issues connecting to the plugin and we would like to troubleshoot the issue with you further.
If you can, please call us so we can get you in touch with our specialized integrations team to investigate this in more detail.
Also just in case, here is a link to documentation how to Install the Constant Contact Forms Plugin for WordPress to Gather Sign-Ups and Feedback:
I will be sure to submit your feedback on this! Happy to hear that you have a form on your site now.