The D-Pad somehow got moved. How do I adjust it?

The solution may be as simple as just randomly pressing the directional pad until it pops back into place (you can find more information about how to deal with messed up buttons here).

If that doesn't work, unfortunately you'll have to open up the device and reposition the directional pad that way. You can access the d-pad by removing the speaker components from the device (follow the steps in the speaker replacement guide).