MyCustomPostType helps you to add Custom Post Types straight from your Administration. After you activated it, you have a new submenu in Setting Menu which is called My CPT. From here, you just need to fill in the form with your informations, choose a few options such as icon file, supports… or just leave it to the default values !
Once done and validated, you may need to refresh your page to see your new post type appears under the Comments menu.
The Username and Password for Live Preview are admin / admin.
It appears that the Live Preview link doesn’t work properly. If you want to test the plugin, please go to http://dev.acrv.fr/marketplace-mycpt/wp-login.php