Profile: albertoA-8

Problem:

I have a post form, and I try to set a custom post title for all entries as default.

Solution:

Please go to the post form edit screen and expand the post title field and there you can add a default value for the post title.

Then if you do not want the customer to change the title in the post form in the front end, you can use CSS code to hide the post title field from the form in the front end.