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