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