Hi there,
Are you talking about adding an extra internal floppy in your 2000?
This picture might help you.
The DF0 drive jumper stays the same. DF1 jumper sits on the two right pins. The upper row of pins is not used at all (see picture).
Close jumper J301 on the motherboard. Page A-23 of the Amiga 2000 manual says this jumper has to be closed in order for the Amiga to recognize an ID bit stream from each floppy. This is normally not necessary when there's only one internal floppy. (You already knew that)
Have fun.
Fester