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