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