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