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