In the rich text editor:
@DyingSpark
In a comment:
[DyingSpark](https://chowlings.com/user/DyingSpark)
For Names and Avatars:
In the rich text editor:
%DyingSpark
In a comment:
[![DyingSpark's Avatar](https://chowlings.com/images/avatars/970.jpg?v=1644063341)](https://chowlings.com/user/DyingSpark) [DyingSpark](https://chowlings.com/user/DyingSpark)