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