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