Step 1: come to the directory you want to protect, create a file index.php which has

<?php
phpinfo();
?>

and get the home directory from DOCUMENT_ROOT

Step 2: modify .htaccess and add this snippet

AuthType Basic
AuthName "restricted area"
AuthUserFile /home4/ninscore/public_html/dengph/.htpasswd
# AuthUserFile {DOCUMENT_ROOT/.htpasswd}
require valid-user

Step 3: create .htpasswd

the password is usually MD5

https://shop.alterlinks.com/htpasswd/htpasswd.php

https://hostingcanada.org/htpasswd-generator/

Some errors:

1. Which directory will be locked depends on which .htaccess you modify.
2. You may get Internal Error since your Document_Root is wrong, it should be same as phpinfo();
3. It keeps asking password. You need to use the attached link to get your generated password.