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