How do you rate a seller on Amazon?

[Emerald_Door]

I bought a new book on Amazon and received an obviously used book.  The seller enclosed a packing slip with a handwritten message asking me to rate them on Amazon.  Instead, I emailed the seller and expressed my disappointment in receiving a used book when I selected and paid for a new book.  The seller did not respond. 

Now Amazon has sent me an email asking me to review my purchase.  It's a bit confusing because it takes me to a link to review the book.  That explains why sometimes the reviews are about the sellers rather than the items. 

How does one rate the seller?  

[Emerald_Door]

I found it. You have to look in your buying account. I probably won't leave a rating, but at least now I know how it works.