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