The User Guide manual (see http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03664108-3.pdf ) describes (for both Windows and Mac OSX host systems) how to store a print job at the device.
Then (again from the User Guide manual), to print a job that is stored in the product memory:
1. From the Home screen on the product control panel, scroll to and touch the Retrieve from Device
Memory button.
2. Select the name of the folder where the job is stored.
3. Select the name of the job. If the job is private or encrypted, enter the PIN or password.
4. Adjust the number of copies, and then touch the Start button to print the job.