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