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