How can i create pin posts?

Hi reddit users, i have a question. I need to create new category of posts for a website i didnt made, and i dont know how. In a pic there is pinned post called "Příspěvky". Need to make something similar.

PS: Who´s wondering, it´s czech.

https://preview.redd.it/sj6nsulmp0ld1.png?width=162&format=png&auto=webp&s=efc274b61a0e3131780d14baae79d2bff5f416cf