in case you do not have access to the area of your WordPress site, then you will need to manually backup your database and files.. lot of times, your browser may not realize that WordPress page or post has changed and will load it from the browser cache. You need to clear your WordPress cache to make sure that your website is not serving cached version. 4. then you will need to use FTP or phpMyAdmin to deactivate all plugins.. then you may want to see our how to use FTP to upload files to WordPress.. then you will need to use FTP to switch theme.. then you can change these URLs using FTP. Do not forget to change WordPress URLs from the settings page after you login to your site. Login to your WordPress site and go to Settings » Reading page. then you should scan your website with Sucuri.
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