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:
[](https://chowlings.com/user/DyingSpark) [DyingSpark](https://chowlings.com/user/DyingSpark)