CFDB: How to display submitted content on a WP category page

I want to display all submissions of ‘myform’ as posts of a certain category ‘mycategory’ on a WP category page.
One column is named ‘mytitle’. Another one ‘mycontent’.

1)
How to generate short code the right way, that each submission is displayed with ‘mytitle’ (= Post Title), and excerpt ‘mycontent’?

2)
Where to put that shortcode:
a) WP admin panel > some new page, or
b) into a specific php-script (if yes, what would be its name)?

Thanks from a WP-beginner
Frank