Online store, technical work

1) hacked to distribute the redirected to online casino
2) do not login to the admin panel 502 bad gatway
3) after changing the password on the host, manually remove references to the "dirty" resources, and replacement passwords for the databases stopped working and the website. Joomla site
4) make the certificate, now popping up to the site (not secure)
5) to carry out those works on the website