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