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