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