In the rich text editor:
@Demonlove00
In a comment:
[Demonlove00](https://chowlings.com/user/Demonlove00)
For Names and Avatars:
In the rich text editor:
%Demonlove00
In a comment:
[![Demonlove00's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Demonlove00) [Demonlove00](https://chowlings.com/user/Demonlove00)