Upon accessing this menu, you'll be able to keep different "profiles" of your Custom control settings. Enter the name of the profile you want to create. This will you access to the control configuration of various controllers connected to the console.
Rumble: You can turn this on or off if the controller supports this feature
Tap Jump: This toggles the ability to jump by tilting the circle pad up.
Shake to Smash: This option is only available to the Wiimote + Nunchuck controller.
Test: By pressing Start, this will allow you to test the configurations you've changed.
Save: Save the button config and leave the screen.
The screens below will display the default button assignments for each controller type.
Standard Controllers
Gamecube Controller
Wiimote and Nunchuck
Wii Remote
3DS
If you have a 3DS version of the game, you can "pair" your 3DS to the Wii U and use the handheld as your controller. Follow this page to learn how.