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