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