How to use your Photo for the Blog Background?
Requirement- You should be using a Template Designed using the Blogger Template Designer
Steps
1.Login to your Blogger in Draft Dashboard at http://draft.blogger .com
2. Go to the Design Link and Click on the Template Designer
3. Click on Background Image under the Background Tab
3. In the Overlay Window you can upload your own Image
4. Once the upload completes, click on the uploaded image and you will be able to see a live preview
5. Click Done and Apply these Changes to the blog.