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