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