1. 123 HP DeskJet 3720 ePrint
HP ePrint is a free cloud-based and secured service which helps you to print from anywhere with an active internet connection. Send your documents to the printer using email and your printer will print the document directly. To know more about the HP ePrint setup, go through the below article Before initializing the setup, you have to gather some of the requirements. Then, if you do not acquire all the below given requirements, then you will not be able to print using the HP ePrint.
Then, find your printer email address by touching the ePrint icon on the Home screen and touch the Web Services settings menu and touch Display Email address. Email your document to the printer, create a new email and attach the document to print. Now send the email to the printer email address. Now the printer prints the attached document.
Then, check the requirements for print using ePrint. Initially the printer address in the TO: field only. Other email address should be in the Cc: field. A blank email subject line will lead to HP ePrint error or it will cancel the print job. Finally, open office files are not supported. Printing on both sides is not supported.