Hi @lutsukomm,

The phrase can be found and changed in the Dashboard > wpDiscuz > Phrases > Comment tab. 

I see, thank you very much.

Just one more question. Is there any way to put the same field/design as that "teacher" to here named "student" ?

@lutsukomm,

If the usergroup exists, you can enable it in the Dashboard > wpDiscuz > Settings > User Labels and Badges admin page, just find the "Display Comment Author Labels" section. 

Please check out this doc, you'll find more information here: https://wpdiscuz.com/docs/wpdiscuz-7/plugin-settings/user-labels-and-badges/#display-comment-author-labels