In the rich text editor:
@nkz
In a comment:
[nkz](https://chowlings.com/user/nkz)
For Names and Avatars:
In the rich text editor:
%nkz
In a comment:
[![nkz's Avatar](https://chowlings.com/images/avatars/1780.png?v=1693141816)](https://chowlings.com/user/nkz) [nkz](https://chowlings.com/user/nkz)