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