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