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