In the rich text editor:
@RA1NBOWS0DA
In a comment:
[RA1NBOWS0DA](https://chowlings.com/user/RA1NBOWS0DA)
For Names and Avatars:
In the rich text editor:
%RA1NBOWS0DA
In a comment:
[![RA1NBOWS0DA's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/RA1NBOWS0DA) [RA1NBOWS0DA](https://chowlings.com/user/RA1NBOWS0DA)