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