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