WP Ghost is compatible with most Apache server types.
For NGINX servers, access to the Nginx config file needs to include the rewrite rules file from WP Ghost. So, in order to use WP Ghost, you need access to the Nginx config file and access to restart the service.
Or, you need to be able to contact the host to add the include path_to_file/hidemywp.conf
file in Nginx and restart the service for you.
There is also the possibility to load WP Ghost Presets without any server configuration required.
Read More: Use WP Ghost with Nginx Hosting Without Editing Config Files