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