You aren't able to edit the order in which items but by adding more or fewer photos or answers, you can control how it displays in the ‘Edit my story’ section of the app.
Answers are always grouped by chapter and any photos you upload, will appear in between each of the chapters you fill in.
So to create a nice balanced profile which alternates between text and photos, just include a similar number of photos to the number of different chapters you decide to fill in.