In the rich text editor:
@Impper-Imp
In a comment:
[Impper-Imp](https://chowlings.com/user/Impper-Imp)
For Names and Avatars:
In the rich text editor:
%Impper-Imp
In a comment:
[](https://chowlings.com/user/Impper-Imp) [Impper-Imp](https://chowlings.com/user/Impper-Imp)