To print to the EPPS Cloud Printer, you need to make sure that you are printing through the Google Chrome Browser or other Google application (drive, docs, sheets, etc). This is because the cloud printer is connected to your google account, not your device.
When choosing which printer to use, select EPPS-CloudPrinter.
Then go to any of the designated printing stations and log in with your District Login (not your google information).
There you should see your print jobs listed, ready to print.
You can print from any computer, even at home. A print job will remain in queue for 24hours. If it's not printed in that time, it will be lost.