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