In the rich text editor:
@CyberneticSanity
In a comment:
[CyberneticSanity](https://chowlings.com/user/CyberneticSanity)
For Names and Avatars:
In the rich text editor:
%CyberneticSanity
In a comment:
[](https://chowlings.com/user/CyberneticSanity) [CyberneticSanity](https://chowlings.com/user/CyberneticSanity)