I am currently managing a Concrete5 website for a client, and I am trying to add a new news post type. Currently I have two sections; News and Press Releases (see image).

I am needing to add another one of these in order to display the posts on a new page using the 'Latest News' block. I've had a look through the backend of the website but cannot find anything regarding where these can be added/edited.

I'm a complete newbie when it comes to Concrete5, so any help would be appreciated.

Thank you.

Edit:
Version: 5.7.5.12