1.First of all log in to your account .
2.After log in you will land on your blogger dashboard.
3.select the blog you want to delete if you have many blog other wise simply go to the the setting.
4.click on the 'other ' at the bottom of setting
5.then you will see the delete option as given shown
6.now click on delete and confirm it.
Note-You can recover your blog within a certain period of time(90 days)