In the rich text editor:
@Runt
In a comment:
[Runt](https://chowlings.com/user/Runt)
For Names and Avatars:
In the rich text editor:
%Runt
In a comment:
[![Runt's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Runt) [Runt](https://chowlings.com/user/Runt)