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