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