Add book to an already created series

[Maggie]

Hello. My current series is The Matawapit Family. Sanctified is not showing as part of the series. I looked and looked on how to add a book to a series, but it says I need the "edit" button, which I can't see from my computer. Can someone please help me add Sanctified to this series? Thank you very much.

[Florian]

done