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