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