I'm one of those netizens who didn't share the Facebook look back on the Facebook timeline. Some people would say, "Who cares?" :)
But the main reason why I didn't share it was the photos included in the slideshow are unpleasant. Now that the look back is enabled by the Facebook team to be edited, maybe I could share it already. :)
Anyway, if you want to edit your Facebook look back, here's what you have to do:
Related article: Facebook Look Back | Happy 10th Year Anniversary, Facebook
Go to Facebook Lookback and click the button Editor go directly to https://www.facebook.com/lookback/edit/.
Related article: Editing of Facebook Look Back Movie is Now Available
Click the photos you want to include in the slideshow. The checked photos (with blue background) indicates that the photo is already chosen. There are already pre-selected photos which is indicated by the blue check but you can uncheck photos you don't want.
Your First Moments category allows 3 photos. Your Most Liked Posts allows only 4 while Uploaded Photos is 9 and Photo Grids can allow 38 possible photos.