itunes not responding to the correct password

I won't be able to see the About iTunes because I cannot even get into it, it wasn't clickable. Actually, the app is open but is not working because I am being asked to type in my password, which, even when correct, is not acknowledged. I checked iTunes store in my fone and it is working, but I find no About iTunes thing there. As for my two-factor authentication, locations and codes were being sent to my ipad and fone, and they are working just fine. I am just bothered with my macbook because the app is just open in the desktop and kind'a disturbing me whenever I work. Thanks so much for being patient to help me.

It worked! I don't know how but it did! Thank you very much. I wasn't asked of the password anymore when I turned on my mac, even when I tried iTunes, and closed it and tried again... the box never appeared! God bless you for helping me!

thanks for responding, but I am sorry because I don't know how to find out what the version of my itunes is. And, yes, i have enabled two-factor authentication in my account.