In the rich text editor:
@Ghost-ily
In a comment:
[Ghost-ily](https://chowlings.com/user/Ghost-ily)
For Names and Avatars:
In the rich text editor:
%Ghost-ily
In a comment:
[![Ghost-ily's Avatar](https://chowlings.com/images/avatars/1307.png?v=1645626780)](https://chowlings.com/user/Ghost-ily) [Ghost-ily](https://chowlings.com/user/Ghost-ily)