Try reading the sentences in reverse order:
It is important that the printer has exactly the same name as the cups printer name.
On the print server, preview http://localhost:631 for the cups interface.
(This is the cups web interface, where you can get the exact printer name to use, assuming you have it set up on your system.)
Add a product on the mkahawa-server interface with exactly the same name as in the print-server's cups interface.
(Add the printer name you got from cups).
I've never used mkahawa though, so I'm just going by the text you gave.