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