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