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