What app do I need to print from an older Android device (version 4.3 or older)?

For older Android devices running version 4.3 or older, you need to download the HP ePrint app from the Google Play Store. Newer Android devices running version 4.4 or newer can print by opening the item, selecting the Menu button, selecting Print, choosing the printer, and selecting Print. Some newer Android devices may also require the HP Print Service plugin app from the Google Play Store. (Page 2)