If you want to delete your blog permanently, follow the steps
Login to you blogger account select blog which you want to delete from
Go to setting menu
Scroll down to Manage Blog section
There you find "Remove your blog" option , Click on this link it will give you a warning pop up like this
If you want to take backup of your content click on Download Blog Link.
For deleting blog Click on Delete ..
It will redirect to next page ..
From here you can delete permanently or undelete.
Once click on Permanent delete, it will prompt another warning like this
Click on permanent delete and you are done
