Q: How do I change my apple id in iBooks for Mac

Hi, adesigndesk.  

Thank you for visiting Apple Support Communities.  

Here are the steps that will walk you through the process of changing the Apple ID in iBooks for Mac.  

Use your Apple ID with the iBooks Store

1. Open iBooks.
2. Choose Store > Sign In/Out.
3. Enter your Apple ID and password and click Sign In.

iBooks for Mac requires OS X Mavericks v10.9 or later.

Using an existing Apple ID with the iTunes Store, Mac App Store, and iBooks Store

-Jason H.