tell me how to set so that at creation titles, novice, apprentice, expert, adept, master, grandmaster are displayed

You can set a character title with "title_suffix" member.
https://docs.polserver.com/pol100/objref.php#Character

I am interested in where the file is located in which it is edited and in which folder
Pol99

pol099 is a core, so clean pol doesn't have it.
Every distro have its own implementation of title system, and it could be located everywhere.
Which distro do you use?

Zulu Fantasia

No idea whats that.
i would say just search your scripts for "title_suffix" text, and you will find your title system.

After a bit of search
pkg/systems/brainAI/scripts/listen/titleMaster.src:127: mobile.title_suffix := "";
pkg/systems/brainAI/scripts/listen/titleMaster.src:137: mobile.title_suffix := ", "+level+" "+title;

The Zulu Fantasia scripts are defective. They require a lot of work to make them function properly. They were abandoned as the Distro for POL because they never worked properly. I suggest that you use the Classic Distro as the starting place to build your server. https://github.com/polserver/ClassicDistro