Correction of errors on the website (PrestaShop 1.6)

PrestaShop 1.6
belodejda.by

You need to:
1. To fix the error
belodejda.by/new-products
When transferring site to a new server and install the certificate.
Gives the error "the Website works" but the admin panel is only available in the "General settings" on the rest gives an error
Because of this cant replace url pages
2. To return to hide the prices on the website
3. Add 1 warehouse in display cards products