Theosis discussion

I was trying to add my new book, but when I begin to fill out the form, I receive this message: 'The book you are adding may already exist in our database. If it appears below, please use that edition instead of adding a new one'. And it links to this page, which shows my book:
https://www.goodreads.com/book/show/1...

However, although the Add a New Book page tells me I need to "use that edition instead of adding a new one," it does not give instruction on how to do that.

Would you be able to link my book to my author profile for me, please?