Can't Authorize iTunes on New Macbook Pro

Just purchased a new MacBook Pro to replace my old one. I am trying to authorize the new MacBook for my previously purchased iTunes music. When I click Authorize - it tells me I already have 5 computers authorized. I am trying to remove old ones and have gone to "Account" and then "Account Settings" in the iTunes store menu bar. However, when I look under my Apple ID Summary it shows nothing about the number of computers I have authorized. (In the Apple example it is right below Country / Region - however I have nothing below that). Thanks!