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