Accessible Drag & Drop

Hi

I am trying to setup a drag and drop slide in accessible format, using your instructions in following link:  Build an Accessible Drag and Drop Interaction in Storyline - Articulate Storyline Discussions - E-Learning Heroes

Could you advise on the keyboard strokes that are used to select and move the relevant box to the target box?  Do I have to manually set them?

I've followed the instructions in the link above and reviewed the support video but I can't locate reference to the keystrokes required to select and move - I'm obviously missing something at this point.

If you could help with this final bit, that would be great.

Thanks.

Dorothy