Want to add 2nd internal floppy to A4000. How to set jumper ???

[Effy]

I have removed one floppy from an A4000 and want to add it to another A4000 that already has got one. Now I have already found out that it´s not as easy as I thought.There seem to be 6 pins on the back of the floppy, and I assume that the standard setting is DF0. Now can anyone tell me how to set the other floppy so it will be recognized as DF1 I prefer to ask it first before I start experimenting ...

[Effy]

Tried that.Then after startup my screen turns to light green (or is it yellow ??) ... tried every possible connection of the floppy cable ...
Now I removed the jumper again and use only one floppy.At startup I still get a light green screen but then the floppy boots up to OS 3.1 ... do I need to worry

[Effy]

Have tried again. Have placed jumper on 351 and connected two A4000 floppies. None of them boots up now unless I insert a bootable floppy in both and then they both boot up and then I get the Insert-floppy-kick3.1 screen ...