Need to install a shopping cart theme on a different page

Hi there.

I have a site on https://www.ameemoo.com with Theme A.

I want to create https://www.ameemoo.com/store with a Shopping Cart theme installed.

I installed WordPress on https://www.ameemoo.com/store but when I type in https://www.ameemoo.com/store/wp-admin, it says Page Not Found. Please help!