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