Can't add my book to its series

[Sara]

https://www.goodreads.com/book/edit/4...

I typed the series in brackets in the title, as advised, and as I did with the first book in the series, but it's not formatting the same way and there's nowhere on the edit page to add it to the series. This is the series page:
https://www.goodreads.com/series/2572...

[free]

author can't add book to series...
added...

[Sara]

Thanks!