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