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