In the rich text editor:
@yukar
In a comment:
[yukar](https://chowlings.com/user/yukar)
For Names and Avatars:
In the rich text editor:
%yukar
In a comment:
[![yukar's Avatar](https://chowlings.com/images/avatars/1643.jpg?v=1662409129)](https://chowlings.com/user/yukar) [yukar](https://chowlings.com/user/yukar)