In the rich text editor:
@ILJ
In a comment:
[ILJ](https://chowlings.com/user/ILJ)
For Names and Avatars:
In the rich text editor:
%ILJ
In a comment:
[![ILJ's Avatar](https://chowlings.com/images/avatars/9.PNG?v=1647703266)](https://chowlings.com/user/ILJ) [ILJ](https://chowlings.com/user/ILJ)