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