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