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