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