Learn how to activate Amazon Prime in its entirety. To activate Amazon Prime Video on your TV, follow the simple instructions and go to amazon.com/mytv. Amazon Prime Video can be activated in three simple ways. Do you want to register your compatible gadget with Amazon.com? Simply go to amazon.com/mytv and follow the instructions to complete your device's enrollment, and you'll be able to start enjoying Amazon Prime Instant Video for free. To enrol your device, you must use the Amazon MY TV code, which is 6 digits long.