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