Photos slideshow on your google Blogger

Go to  https://picasaweb.google.com/home 
You should have your photos ready in Picasa

Before Integrating photos into your blogger, make sure photo books are public, so that they can be accessed from the your google blogger.

Go to Blogger administration, click on “Adding a Gadget” in layout as following.



Add "Slideshow" as following


Select Picasa Web Albums, enter your username (Google account)
System will link to your Picasa automatically, so that you can select which Album(more than one Album) you would like to show by clicking the pull-down icon as following.
Do not forget to save to complete connection.