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