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