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