Please add to series

[Lee]

Hi, can someone please help me combine these two versions of the same title:
1. https://www.goodreads.com/book/show/5...
2. https://www.goodreads.com/book/show/5...

I've tried to do it manually on my own but keep encountering an error.

Thanks!!!

[Emily]

I've combined them.
I also changed the cover from the temporary one to the Kindle one on Amazon.