I made a video on iMovie, downloaded it onto my computer and burned it onto a disc. It said it was successful, but won’t play on my Magnavox DVD player. I made several DVDs and none of them work. I read somewhere that a lower recording speed may help, so I chose the lowest available but it still didn’t work. Then I read something about having to manually finalize the disc, so i tried, but the option to do that, “disc edit” is grayed out and I don’t know how to select it. Please help.