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