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