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