I didn't know how to access the E-Shop, only knew how to switch from Wii U to Wii, and change which screen(TV or Game Pad) had the race in Mario Kart 8
I knew that part, but in my days, Miiverse went down way before I could figure out what it was. Plus, the only E-Shop I ever entered was NS E-Shop. Not 3DS or Wii U