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