How do I trigger an optin popup when a user leaves a comment?
Triggering a popup when a user leaves a comment requires our free sister plugin: Epoch.
After enabling Postmatic Optins, select the Configure Optins tab on the Postmatic navigation menu.
Check off the box next to Enable Popups in the Popup over the page section.
Underneath How would you like to trigger this popup?, select After a user submits a comment.
Scroll down to the bottom of the screen and click on the Save Changes button.