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