In the rich text editor:
@EnyaSol
In a comment:
[EnyaSol](https://chowlings.com/user/EnyaSol)
For Names and Avatars:
In the rich text editor:
%EnyaSol
In a comment:
[![EnyaSol's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/EnyaSol) [EnyaSol](https://chowlings.com/user/EnyaSol)