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