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