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