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