Classifieds - changed name of checkout page now log in gone

Hi,

New install of Classifieds.

I changed the name of the installed 'Checkout' page to get your page however, now the checkout options are gone. Changed the name back but just get a blank page.

Is there a fix for this? How do I get the checkout page back?

Can I modify the menu names to something more suitable for my project, such at pages instead of classified?

Thanks