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