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