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