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