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