Author: If you add user as a author, he/she can only post in your site.
Buyer: If you add user as a buyer, he/she can manage all of your site content like create a new post, code edit, widgets delete or add etc.
How to Add: To add user as a author/buyer just follow my instruction carefully. I think that you will be happy to read this.
1. Login to your blogger account.
2. Then click on your site like
5. Then click on Invite authors. Then your user receive a mail for accept your request. After accept it, you will see your user email there. Default he/she will set as a Author but from this section, you can make him/her Buyer to control your overall site like