Hello, I have a Emerson DVD rw/r EWR20V5, It is a VHS/DVD combo, and I have tried to copy VHS to DVD but it is able to read it and won't copy the VHS. Does anyone know a way around this. I can't figure it out. I thought by buying this it would "copy" as it said it would and it doesn't.

Also what is the best DVD to use when copying....I am not sure the difference between dvd+r, dvd-r, what is this......there is so many DVD types to buy.....Please Help.
Bren