In the rich text editor:
@Crystallinewind
In a comment:
[Crystallinewind](https://chowlings.com/user/Crystallinewind)
For Names and Avatars:
In the rich text editor:
%Crystallinewind
In a comment:
[](https://chowlings.com/user/Crystallinewind) [Crystallinewind](https://chowlings.com/user/Crystallinewind)