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