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