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How to change the saved Office 2013 Product Key

I installed Office 2013 and put in the product key when it asked me to. After typing in the product key, it allowed me to use MS Word once. After I closed MS Word and went to reopen it the next day, it said the product key I entered was incorrect (maybe I typed it in incorrectly). It asked me to change it. I tried opening MS word and clicking File -> Account but was unable to change the product key from there.

I then went to control panel -> uninstall a program and then clicked on Office 2013 and clicked 'change' but it gave me no option to change the product key. So I decided to uninstall and reinstall it.

I uninstalled it and then went to reinstall it with the setup file and now it is giving me an error saying:

Error 25004. The product key you entered cannot be used on this machine. This is most likely due to previous Office 2013 trials being installed.

The first product key I entered seems to be saved somewhere. How do I delete / change it?