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