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