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