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