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