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