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