Having problems combining books

[Gala]

Hello! I recently became a librarian and I'm very excited and passionate about it. However, I feel like and idiot, but I just can't find what is the way to combine different books.
Specific case, I created this new edition of a book (http://www.goodreads.com/book/show/17...) I want to combine it to this edition ( http://www.goodreads.com/book/show/49... ) I just can't find a way to make them appear together ont he combine page. I guess I just don't understand something about combining. I know I may seem as an idiot, because I've been reading the discussions here for hours trying to figure it out. Please explain to me How do I combine two editions/books like these on th elinks. Thank you!

[Renske]

I could find the books on the same page and combined the books. I don't know why they didn't show on the same page for you.

[Gala]

Oh, I just saw they appeared together. Thanks, it probably took some time because I tried combining them just after entering the new edition and it probably wans't on the system still. Thanks for the attention though. :)