Listing page is not letting users register on the front-end of the site.

Hi,

you need to enable registration in WordPress settings.

How to Allow Users to Register

1. Login to the Admin section of your WordPress.
2. Roll your mouse over the Settings link in the navigation menu, then click General.
3. Click the check box next to Anyone can register.
4. Now, click the drop-down box labeled Subscriber.
5. Click the Save Changes button.