As, you know that every blogspot account is owned by a Google Account (Administrator Account). This account can do anything on the blog like write post, delete posts, change template, moderate comments, add new authors etc.
When owner of Blogger account give administrator rights to someone then there are multiple owner of that Blog. That means any one of Administrator can delete post, change templates, moderate comments etc on blog.
How to change ownership of your Blogspot Account?
If you want to change your blogspot admin email address with a new email address i.e. change ownership of your blogger account, then just follow these simple steps:-
1. Open blogspot with your current account.
2. On your blog dashboard click on setting to open it.
3. In Basic setting you will see Add Authors just click to open it.
4. Now enter your new email id or create a new email id on other browser then type your new email id on it, and click on Invite Authors.
5. Open your new email on other browser. You will see a message of invitation to be an author just accept the authorship to your blog.
6. Now go back to your current blogspot dashboard and Grant your new email Admin Privilege. This will give both email address equal control on blogspot.
7. If want to delete your old email from blogspot then click on Remove the user.
Remember Before Removing Your Current Email ID From Blogspot Account Be Sure That You Have Grant Admin Privilege Your New Email ID, Otherwise You Are Not Able To Open Your Blogspot Account.