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