In the rich text editor:
@Devil_m0th
In a comment:
[Devil_m0th](https://chowlings.com/user/Devil_m0th)
For Names and Avatars:
In the rich text editor:
%Devil_m0th
In a comment:
[![Devil_m0th's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Devil_m0th) [Devil_m0th](https://chowlings.com/user/Devil_m0th)