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