what code I need change to help me remove remove index.php from my website url?

Below is my nginx.conf’s server code.
enter image description here

I have already try add below code,but it’s dosent’s work.

location / {
     if (!-e $request_filename){
          rewrite ^/(.*)$ /index.php/$1 last;
     }
}

location / {
    if (-f $request_filename/index.html){
        rewrite (.*) $1/index.html break;
    }
    if (-f $request_filename/index.php){
        rewrite (.*) $1/index.php;
    }
    if (!-f $request_filename){
        rewrite (.*) /index.php;
    }

}