I have a book and the isbn that is on the book keeps coming up as a hardcover and this book is a paperback...BUT the book says it is a hardcover..it says 369 pages hardcover so what do I do?

First, double check that your book does not say anything like ARC, uncorrected proof, advance reader's copy, etc. If it says any of those things, you cannot post it here.

If you're sure it is postable, then use the Post a Book Without an ISBN screen.

You should also read the Help doc "Solutions to common Book Posting Problems"

It is an advance readers edition.....didnt pay attention to that at first  Thank you

You can ask a credit for it in the book bazaar or one of the genre boards WL threads.  You just can't post it into the system and then ask the requestor if they want it anyway.  If it isn't WL then it's unlikely anyone will pay a credit for it. But some people will pay a credit for an ARC of a WL book just to get it faster.