I think I am OK here but I want to make sure. WhenI entered the ISBN the book came up BUT my cover looks different than the picture shown. Is it still OK to send it if the pictures vary as long as the ISBN's are correct?

Hi Jennifer!

As long as the ISBN, Title, Author and binding type match, you're fine.  The cover on your book does not have to match the cover in the PBS listing.

What Kilchurn said

The help center says:

If the book cover image on a listing matches the author and title but doesn't happen to match YOUR copy of the book that has that ISBN:

• This image does not need to be replaced.
• Cover images do NOT have to match the book being listed, because sometimes publishers reprint using the same ISBN but a different cover art.
• ISBN, author, title and booktype must match when you Post a book; cover image does not have to match.

If you want to replace the image, though, Jennifer, you can do that either on the edit book data page (click on the title, then on "more options" to find it) or go to the bottom left corner of any page, and under My Account choose "Member tools" then "Upload book covers." 

An image that's replacing an existing image can sometimes take several week to show up.