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