Wordpress custom fields in custom type post

Hi,
i am creating custom post type with Custompress. When doing so I am checking the box for custom fields to be available. Now, i am not sure it this is for custompress's custom fields or wordpress's custom fields but i do need to use wordpress's custom field and i can find how to do it. how can i enable wordpress custom fields in custom post type ?
I am using "quick-post-widget" plugin for users to create post. however the plugin doesn't recognize the fields create by custompress but do recognize the once created by wordpress.