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