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