Hi my MacBook won't start up using guest user and can't get back to my log in

Hi guest user is just buffering and will not cancel

No, you marked you as the star.
Authorization
Macs:  iTunes Store- About authorization and deauthorization.
Windows: How to Authorize or Deauthorize iTunes | PCWorld.
In iTunes you use the Authorize This Computer or De-authorize This Computer option under the Store menu in iTunes' menubar. For Windows use the ALT-S keys to access it. Or turn on Windows 7 and 8 iTunes menus: iTunes- Turning on iTunes menus in Windows 8 and 7.

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