In the rich text editor:
@Svetlzjg
In a comment:
[Svetlzjg](https://chowlings.com/user/Svetlzjg)
For Names and Avatars:
In the rich text editor:
%Svetlzjg
In a comment:
[![Svetlzjg's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Svetlzjg) [Svetlzjg](https://chowlings.com/user/Svetlzjg)