Here's how to get it:
1.Go to Picasa Web Albums and sign-in with your Google account.

2.Upload or group the pictures together in an album.

3.On my Photo select the album that you want to create for the slideshow.


4.From within the album, go to the right side and edit your album information.Make sure that visibility are either "public on the web" or "Limited,anyone with the link".Then click save change.


5.Now you will see "Link To This Album" appear on the right side. Click on it then,click on "embed slideshow". A pop-up showing slideshow configuration and preview will appear.

6.Go to blogger.com then sign in with your account.

7. To embed in a post,
create a new post, then switch to Edit HTML mode.
Copy and paste the entire code and paste it into your post.click preview and after everything is going to work fine, Save your post and view it. The slideshow should be playing inside the post.

8.To embed in a page element e.g. sidebar,
Go to Design > Page Elements.
Click Add A Gadget link.
Select HTML/Javascript gadget.
Save the slideshow code into the gadget window.
Save and view your blog. The slideshow should playing inside the sidebar.

Done.