In the rich text editor:
@rueyeol
In a comment:
[rueyeol](https://chowlings.com/user/rueyeol)
For Names and Avatars:
In the rich text editor:
%rueyeol
In a comment:
[](https://chowlings.com/user/rueyeol) [rueyeol](https://chowlings.com/user/rueyeol)