If you already have/buy the product key for Microsoft Office 2010, then you need to activate the product online through the Internet. And if you find no column/field in Ms Office 2010 for entering the product key here in this post is how to resolve.
|Sample of error, need to change the product key|
Go To Registry Editor, Press Windows+R the type Regedit, click OK or hit Enter
Navigate to the registry : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Registration\, then delete all value in registration.
Restart MS Office, Now on the activate page will appear column/field to enter the product key.
Open Ms Office
Click on File Menu
Click Change Product Key
Enter The New Product Key
Now ready to online activation.
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