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