In the rich text editor:
@EL-Bjork
In a comment:
[EL-Bjork](https://chowlings.com/user/EL-Bjork)
For Names and Avatars:
In the rich text editor:
%EL-Bjork
In a comment:
[![EL-Bjork's Avatar](https://chowlings.com/images/avatars/1598.png?v=1659640389)](https://chowlings.com/user/EL-Bjork) [EL-Bjork](https://chowlings.com/user/EL-Bjork)