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