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