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