Update Prestashop, correct template and add multi store

I needed Perstashop updated to 1.6 and corrected site with the update. I already installed the new template but unable to view as purchased. If needed, I want to update with the site. 2) add a multi store. When I add a multi store, it do not allow me to add categories or products from the main Admin area. I will have to login to the other site to make the changes wanted.