In the rich text editor:
@Redstar60
In a comment:
[Redstar60](https://chowlings.com/user/Redstar60)
For Names and Avatars:
In the rich text editor:
%Redstar60
In a comment:
[](https://chowlings.com/user/Redstar60) [Redstar60](https://chowlings.com/user/Redstar60)