nginx auth_basic

hi all .

i install apache2 and remove apache2 ,
my root is /var/www/html

i run nginx by auth_basic .

user www-data;
worker_processes 4;
pid /run/;
events {
	worker_connections 768;
http {
	sendfile on;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 65;
	types_hash_max_size 2048;
	include /etc/nginx/mime.types;
	default_type application/octet-stream;

auth_basic "Restricted";
auth_basic_user_file /usr/share/nginx/.htpasswd;

	ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
	ssl_prefer_server_ciphers on;
	access_log /var/log/nginx/access.log;
	error_log /var/log/nginx/error.log;
	gzip on;
	gzip_disable "msie6";
	include /etc/nginx/conf.d/*.conf;
	include /etc/nginx/sites-enabled/*;

but i donot know how to do virtual host by dietpi .