1. Go to Blogger Dashboard.
2. Click on your Blog Title.
3. Navigate to Layout tab.
4. Click on one of Add a Gadget link in Page Elements tab.
5. Scroll and find Slideshow element from Blogger gadget list and add it to your page.
6. Configure your slideshow in configuration pop up. Select your source, speed of slideshow and other options you would like to have.
7. Click Save button.
8. Now arrange your Slideshow element in your page.
9. Preview your blog and click Save arrangement button.