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