Hi there,
Glad you’re enjoying GP and WPSP! Thank you!
There should be an option to add your own No Results message for the list in the “More Settings” tab of your list.
To style it, you can use the wpsp-no-results selector:
.wpsp-no-results {
}It’s not possible to include a page/post there instead, unfortunately.
Let me know if you need more info 🙂