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