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Please go to Settings, Store, and select the apple ID account and sign out, then sign back in the correct account.

If needed, go to Settings > Mail, Contacts, Calendars and remove the wrong account if it's there.

If that does not work, since this is a new iPad, you can just reset it:

• Connect the iPad to your computer with the USB Cable.
• Open iTunes program on your computer (make sure you iTunes program is up to date: http://www.apple.com/itunes/download/)
  
• On the iPad, press and hold the Home button and the Power button at the same time.
• After about 10 seconds release the Power button, but continue holding the Home button until the iTunes program shows that it has detected an iPad in recovery mode.
• Click OK or Restore.