In the rich text editor:
@HyenaHavoc
In a comment:
[HyenaHavoc](https://chowlings.com/user/HyenaHavoc)
For Names and Avatars:
In the rich text editor:
%HyenaHavoc
In a comment:
[![HyenaHavoc's Avatar](https://chowlings.com/images/avatars/1144.png?v=1644063255)](https://chowlings.com/user/HyenaHavoc) [HyenaHavoc](https://chowlings.com/user/HyenaHavoc)