Again: always check, then double-check your books before moving on to the ordering process! Seriously, take our advice, because quite often if you hit the order button, you cannot make modifications on the ordered product. So if you want to see the required modifications, you have to reorder your book and bear all costs.
However, some companies provide customers the option to back out of the business within a rather short period of time, usually around 90 minutes. But after that time expires, your order will be processed and delivered as it is.