If you mean the link in the first reply, ..its not support its a link to an online store, if you register - the book is free. There are also a limited number of free similar books in the Apple iBookstore.
The post here may help you - https://discussions.apple.com/thread/5268237?tstart=0
Support for iBA from Apple...
Global Phone Support
We have expanded English-language publisher phone support. To make contacting the iBookstore support even easier, new local phone numbers are now available for Australia, France, Germany, Italy, Netherlands, Spain, and the U.K. Support is available Monday to Friday, from 7 a.m. to 5 p.m. (PT).
Country Phone Number Australia 1300 307 504
Note that this is a low tariff number.
France 0805 540 117 Germany 0800 664 5307 Italy 800 915 902 Netherlands 0800 0201 578 Spain 900 812 687 U.K. 0800 975 0615 U.S. +1 (877) 206-2092
Toll-free from U.S. and Canada.