Thank you for reaching out to Constant Contact API Developer Support, and for your patience. My team is here to assist outside software developers with questions about building into Constant Contact's API.
There isn’t currently a setting within the Constant Contact Wordpress plugin that allows you to edit or remove the red asterisks for required fields. It may be a better solution to use a 3rd party form that better meets your needs aesthetically, or you could develop your own using our V3 API.
While we do not provide support for 3rd party plugins, there are several 3rd party forms available in the Wordpress Plugins store that are compatible with Constant Contact.
WordPress Plugins:
https://wordpress.org/plugins/search/constant+contact/
Get started using the Constant Contact V3 API:
https://v3.developer.constantcontact.com/api_guide/getting_started.html
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