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