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