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