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