In the rich text editor:
@KingBlue05
In a comment:
[KingBlue05](https://chowlings.com/user/KingBlue05)
For Names and Avatars:
In the rich text editor:
%KingBlue05
In a comment:
[![KingBlue05's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/KingBlue05) [KingBlue05](https://chowlings.com/user/KingBlue05)