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