If you want to just copy an unprotected DVD with Replay Converter, the
easiest way is just selecting the "Burn to CD/DVD" option and then selecting
"Copy DVD" in the target format drop down list. No need in clicking the
"Add DVD" button. Replay Converter will find the DVD and create an ISO file
for you automatically. Then once Replay Converter asks you if you want to
use the same DVD settings, then that is when you should change the DVD in
your DVD drive to the blank one.