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