the form is showing on the posts but when I want to use:
- Sidebar Optin Form widget
- Text widget and put the shortcode [optin-cat id=143]
I get this message
“Please make sure to connect your form to your email marketing provider and to select a thank you page.” in the background and this message on the site: Optin Cat: Invalid Form ID
it shows [optin-cat id=143] o the site.
What can I do?
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