In the rich text editor:
@PuppyPrince01
In a comment:
[PuppyPrince01](https://chowlings.com/user/PuppyPrince01)
For Names and Avatars:
In the rich text editor:
%PuppyPrince01
In a comment:
[![PuppyPrince01's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/PuppyPrince01) [PuppyPrince01](https://chowlings.com/user/PuppyPrince01)