When you send something to print you need to make sure you wait for the papercut client to popup on your computer, otherwise the job won't show up on the photocopier release page.
If papercut is not popping up browse to the following link and download the papercut shortcut. Papercut Shortcut
Once the shortcut has downloaded double click on it and wait for the papercut icon to show up in the task tray on the bottom right of your screen.
You should now be able to release print jobs.