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