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:
[](https://chowlings.com/user/Ressicle) [Ressicle](https://chowlings.com/user/Ressicle)