My Toshiba RDXV60KB will not 'finish ' a dvd after downloading film copied ?

I am unable to access the Setup screen, and as a consequence, I can't access many functions that are essential when capturing film, editing and copying from the hard drive to a dvd. I have been able to copy material, but unable to 'finish the disc in order that it can be shown on any other machine. Is there anyone out there who can help? I have had help from a friend who has an earlier version of this machine and it has enabled me to identify what is the problem.