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