Add more "Authors" and "Owners" to your blog

Here you may got one doubt that

"Why should I add more "Authors" & "Owner" to my blog?"

Let me explain.Suppose you have a group in your college and you have blog.Your friends has different views and ideas.So they wanted to associate with your blog.So you have to allow them and add them as "Blog Authors".If you want to sale your blog or you want to transfer to some one.Then you have to add a "Blog Owner".Now we will see how to add Authors and Owners.
Log in to your blogger account.Then Dash board->setting->Permissions.There you can see blog authors and blog readers.Bellow you can see "add authors".Click on it you can be asked the emails of Authors you wanted to invite.Then the author can be invited and he can post on your blog."But he can't edit and delete" anything on your blog.He plays a role of guest on your blog.
If you can click on "Guest" it can be changed to admin(Red arrow).

That means he got full control on your blog and he can delete and edit anything on it and "He can delete you as Admin".So be careful while inviting others as admin.