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