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