As for the problem with the right screw on the cover the following tips:
One presses the lid slightly down on the threads of the bottle and then turn it opposite to the closing direction, until you feel a subtle downward movement of the lid, which illustrates the proper latching in the said thread. Now you turn the lid in closing direction and rejoice that it is able to close a lid.
So why only 4 stars?
So chic black may be, it's more of a hindrance if you want to read the meter display of the cup. Therefore an unfortunately remains nothing more than for filling the container turn the light on or to wait for an even held Supernova front of the kitchen window. Since this is a little inconvenient, I therefore prefer a ZIP code, at least as long as the luminescent milk has not yet been invented, which would be pretty cool if you ask me.