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