Problems finalizing w/ DMR-E55

I have a Panny DMR-E55. I’ve been recording TV shows onto a Panasonic DVD-Ram disc with no problems at all. I can watch the shows on the E-55, but I’ve attempted to watch the DVD on two different DVD players as well as my Mac computer, without any luck. I cannot find where I’m supposed to Finalize the disc. Any help would be greatly appreciated.