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