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