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:
[](https://chowlings.com/user/Cauliflower) [Cauliflower](https://chowlings.com/user/Cauliflower)