In the rich text editor:
@Knive
In a comment:
[Knive](https://chowlings.com/user/Knive)
For Names and Avatars:
In the rich text editor:
%Knive
In a comment:
[![Knive's Avatar](https://chowlings.com/images/avatars/1822.jpg?v=1670356414)](https://chowlings.com/user/Knive) [Knive](https://chowlings.com/user/Knive)