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