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