In the rich text editor:
@M3ltd0wn28
In a comment:
[M3ltd0wn28](https://chowlings.com/user/M3ltd0wn28)
For Names and Avatars:
In the rich text editor:
%M3ltd0wn28
In a comment:
[![M3ltd0wn28's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/M3ltd0wn28) [M3ltd0wn28](https://chowlings.com/user/M3ltd0wn28)