Thanks everyone for your comments.
I had tried the "page parent" previously before posting this, but it wouldn't give me the selection I wanted (which was "book reviews")... I may have been in my "book reviews" page already (probably editing) that the list on the right in "page parent" would not include that particular page (book reviews). Instead, it only listed the other pages I have, which made no sense to select because I didn't need to post a "book review" in any other page such as "biography" etc.
Your instructions note to create a new page and then give it the parent page option. I thought for sure I had tried that route too, but perhaps not. Is it possible that the template I've chosen is only allowed so many pages? I know in your FAQ it mentions we're allowed as many posts and pages as we want but perhaps that's not available in all templates?
I will try creating a new page again while your instructions have given me an idea to name the new page by the book title and then select "book reviews" in page parent.
Also, last question:
When would I select the "archives" or "links" option in the right hand column? Is it just a regular post that will still go to the top of my blog but for convenience it automatically gives it a link in the link list so I'm not doing it manually? I have the "recent posts" widget and the "archive" widget in my template so I'm not sure why I would need these options in the right column?
Thank you once again for your help.