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