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