In the rich text editor:
@Feunin
In a comment:
[Feunin](https://chowlings.com/user/Feunin)
For Names and Avatars:
In the rich text editor:
%Feunin
In a comment:
[](https://chowlings.com/user/Feunin) [Feunin](https://chowlings.com/user/Feunin)