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