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