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