Help!!!  They did not install it upon delivery BECAUSE we were not told that we needed to purchase some items (which we happily would have) in order for them to do so.  We thought we could complete install ourselves, but clearly we're missing the additional 3 or 4-prong plug that needs to be connected to the back.  Problem is, we literally can't figure out WHERE to connect that!  There's no obvious cover or plate on the back of the machine!  We've got an appointment set for two weeks from now, but I really would prefer not to wait that long!  Any geniuses out there who can help w/ this?  THANK YOU!