It's very easy to add your own image in the blogger to use as the background image. Just follow the steps.
Sign In to your blogger account and click on DESIGN. Then click on Template designer.
Select the file you want to use as your background image and then click OK.
Don't forget to click on APPLY TO BLOG
Sign In to your blogger account and click on DESIGN. Then click on Template designer.
Then click on background.
Select the file you want to use as your background image and then click OK.
Don't forget to click on APPLY TO BLOG
That's it.