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Apache

If your server is running Apache (your web host will know if you don’t), you can create a file named .htaccess on the server at the root of your site. The following configuration should work for most servers: 
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

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Nginx

If your server is running Nginx (your web host will know if you don’t), you’ll have to modify one of the servers files to get URL re-writing working properly. You can edit the /etc/nginx/conf.d/default.conf file and add the following to your server object: 
location / {
    # Check if a file or directory index file exists, else route it to index.php.
    try_files $uri $uri/ /index.php;
}
Before attempt to make this change, talk to your web host. They may have different ways of handling URL re-writing that are easier and potentially less disruptive to your server.