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