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