If your app or website/webpage/webpost is built using WordPress, you can take advantage of the MailBluster WordPress plugin available here. Simply install it on your WordPress site.
The MailBluster WordPress Plugin provides basic functionality, such as the ability to create simple forms. These forms enable site visitors to easily subscribe, automatically adding them to your MailBluster mailing list without any manual intervention.
Please Note: The plugin and its basic form are not designed for checkout and do not include e-commerce functionality.