windows – Where to put it on (Nignix)

I am new to nginx, I am doing a public photo server but my colleagues have noticed
Pictures can be seen there at http://51.77.35.159/capes/OgnisYT. Just enter the IP address and path.
I made a scrypt that will secure it in nignix but I don’t know where to paste it, please help
and here is this crypt.
if ($http_useragent !~* “”) {
return https://www.youtube.com/watch?v=K8UT0OBaaJ4;
}

I don’t want to change the script for any better or something I just want to know where to paste it

As if someone didn’t have sites-anvalible

server {
listen 80 default_server;
listen (::):80 default_server;

# SSL configuration
#
# listen 443 ssl default_server;
# listen (::):443 ssl default_server;
#
# Note: You should disable gzip for SSL traffic.
# See: https://bugs.debian.org/773332
#
# Read up on ssl_ciphers to ensure a secure configuration.
# See: https://bugs.debian.org/765782
#
# Self signed certs generated by the ssl-cert package
# Don't use them in a production server!
#
# include snippets/snakeoil.conf;


root /var/www/html;

# Add index.php to the list if you are using PHP
index index.html index.htm index.nginx-debian.html;

server_name _;

location / {
    # First attempt to serve request as file, then
    # as directory, then fall back to displaying a 404.
    try_files $uri $uri/ =404;
}


# pass PHP scripts to FastCGI server
#
#location ~ .php$ {
#   include snippets/fastcgi-php.conf;
#
#   # With php-fpm (or other unix sockets):
#   fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
#   # With php-cgi (or other tcp sockets):
#   fastcgi_pass 127.0.0.1:9000;
#}

# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /.ht {
#   deny all;
#}

}

#server {

#}