In the rich text editor:
@apotheoseity
In a comment:
[apotheoseity](https://chowlings.com/user/apotheoseity)
For Names and Avatars:
In the rich text editor:
%apotheoseity
In a comment:
[![apotheoseity's Avatar](https://chowlings.com/images/avatars/674.png?v=1646880981)](https://chowlings.com/user/apotheoseity) [apotheoseity](https://chowlings.com/user/apotheoseity)