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