I have completed making my movie and when I go to burn it to disc, I am told that I do not have enough memory and that I should change the resolution in order to save.  It is very long 2.45 hours.  Now I have looked this up and it tells me to select pictures etc. etc.  My problem is that I have already made the movie and would like to change it for the movie that I have already created.  Can I change the settings once the movie is made??  Or do I have to start over again???