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