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