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