You need to go to FiOS TV CENTRAL and enable remote DVR function. Requires a Verizon log-in (your verizon.net email and password).
The FiOS TV Remote DVR in the ‘Settings’ menu allows the user to browse and search TV Listings, DVR and Parental Controls, and viewing featured VOD Titles using Verizon Wireless Mobile device or Web connected PC. This feature is available only to FiOS HM-DVR Customers (2708, 6416 and 7216).
The user can perform the ‘FiOS TV Remote DVR’ operation by following the steps below:
Fiber Solution Center
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The only correction to what VZ_Frank said is you dont have to have the HM-DVR, its available to all DVR users.