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