How do I set up Mobile Printing and Web Services on the HP DesignJet T520?
First, ensure your printer is correctly connected to the Internet, then enable Web Services by tapping the Web Services icon on the home screen and following the front panel instructions — the printer may restart if it updates its firmware. Optionally, activate your account by clicking the activation link sent to your email, and log in at HP Connected (http://www.hpconnected.com) to customize your printer's email address and manage printer security. For iOS devices, printing is enabled through AirPrint; for Android, install the HP Print Service App from Google Play.
From the official HP Designjet T520 Printer manual, page 21
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