There are two places where your author name and book title display: on the cover of your printed book and in our online bookstore.
Change what's printed on your book
If you'd like to edit the title or author name that is printed on the cover of your book, open the Blurb Book Creator in InDesign and edit the cover file, then upload that new version.
Change what's displayed online, but NOT what's printed on your book
Perhaps you only want to edit the display of the title or author name in our online bookstore and not what is printed on the cover. In that case, open the Blurb Book Creator in InDesign and edit those fields in the Book Details section, then upload that new version. Changing just these fields will not change any text printed on your cover.