admin panel for admin only

I have my site set up so people can register and make a post on the site itself with a plugin called posthaste. they can login and register on the site itself and it redirects them to the site with out them seeing the admin panel.

I just want to secure the panel so that the admin (that is me) is the only one who would be able to see the panel if i were to type in the actual url to a certain page in the panel.

Since each register user is logged in as author if they were to type in the actual url to the wp-admin panel they would be able to get on the panel.

so i just want to hide the panel from everyone except myself..

any help our guide will be greatly appreciated.

thanks.