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