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