You are the "best" at apps and you can't work out how to edit your website's theme? Your site uses WordPress - edit your theme so that as each post and page is echo'd out you have the appropriate additional tags. Maybe I don't understand the "detail" you need. Where do we need to start? From the point where you open the theme files in a text editor? Or back a step to understanding which of your theme's files you need to edit? On the other hand you appear to be using Yoast so it should be managing your structured data for you: https://yoast.com/structured-data-schema-ultimate-guide/
You can Use Google's structured data markup helper and follow the steps or install WordPress plugins if using & remember choose the types of markup...as your relevant....