Having been working with Word since Office 97, I was not fond of the "Ribbon", though I have been somewhat successful at retraining my "recall" of the Ribbon layout.
I figured out how to set your header requirement in under a minute; Insert Ribbon, Header - Blank 3 column, set right column text by selecting the 3 vertical dot icon then from the Page Number dropdown choose Current Position. You can also use the Insert Alignment Tab option while editing the header.