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