i have word-press blog( website) and i wanna add database system in my word-press blog. database system means user can register and he can make new post.
is it possible can any one help me?
You don't need to create anything extra for users to be able to register on your website, in your admin panel under Settings > General find the option for Membership and check the "Anyone can register" box. Next choose the default role a user gets which by default is subscriber and that's how it should stay, once you have ensured user membership is enabled make sure your logged out and visit www.yoursite.com/wp-login.php and under the login form will be a registration link.
I think you can use WordPress Profile Builder: a front-end user registration, login and edit-profile plugin