Hello!
I want to start over from the beginning.
After installing Newsletter, the fixed page created automatically was deleted.
Then, the items on each setting page (Goodbye message) stopped working.
The following was written on the dashboard.
《He Newsletter dedicated page does not contain the [newsletter] shortcode. If you’re using a visual composer it could be ok. Edit the page.
* Since I can’t speak English, I use Google translation.
Thank you!