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