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