In the rich text editor:
@Ambunny
In a comment:
[Ambunny](https://painted-relics.com/user/Ambunny)
For Names and Avatars:
In the rich text editor:
%Ambunny
In a comment:
[](https://painted-relics.com/user/Ambunny) [Ambunny](https://painted-relics.com/user/Ambunny)