On the page where you have viewed your proof, there are two radial buttons - one to Approve, and the other to Reject. If you click the Reject option, a text box will appear and you can enter the changes you would like to see made to your proofs.
BookBaby can only apply changes to files we have designed for print or converted to an eBook in-house. We cannot apply individual changes to supplied PDFs or supplied ePubs. In the instance you need to change your supplied PDF or ePub, please reject the applicable proof and email our Support team the new file at firstname.lastname@example.org. Supplied files larger then 20mbs need to be sent in via a large transfer link such as Dropbox or WeTransfer.