Change target drive

How can I change the target drive for DVDFAB Express? My source drive is D:
as is my target drive. When I access DVDFAB express it shows source as D:
and target as E: and will not let me change.

Does your D: is a DVD writer? If no, you cannot select it as Target.

Yes, D: is my dvd writer. I also have an E: drive but it is cd only.

I’ve made many copies before, when I place a source DVD in drive D: and open DVDFAB express it used to open showing D: as both my source and target drive. after reading the DVD I am prompted to put a blankk DVD in D: then it writes by copy.

Now when I put a DVD in D: and call up express it shows d: as my source and E: as target.