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