You can just press the email button to email the link on houzz, that would be the easiest method.

To export - a brute force method - from a PC (I don't know how to do it from MAC, but it would be similar), open a new file in WORD (or other favorite program), go to your idea book, press CTRL-a (select all), press CTRL-c (copy), go back to your new file and press CTRL-v and retrieve your idea book (and you might want to remove some extraneous stuff). There's likely a more elegant method.
:) Rhoda