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