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