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