install Portable Dishwasher

I just moved into a new appartment and there is a portable dishwashere there.. and no users guide.. how do I hook it up???
It has one plastic thing in the back with two pipes connected to it.......
and the plastic thing wont fit on a pipe for some reason

dw

It fits onto a fitting that screws onto the end of the faucet, in place of the aerator. If yours is gone, most hardware stores should have a new one, although you may have to try a couple to find the one that fits your faucet and DW.