There are a number of excellent tutorials. I recommend this one:
Basically, you are going to create a .htaccess file in the directory you want to protect. This .htaccess file will have a line in it, AuthUserFile
, that will point to an htpasswd file.
Authtype Basic
AuthName "RESTRICTED - cloudkicker"
AuthUserFile <path to your htpasswd file>
Require valid-user
The htpasswd file should be placed outside of your web directory (e.g., /etc/apache2/myhtpasswdfile). This htpasswd file will contain a username and a password hash, like this:
testuser:{SHA}3S7bh+qet6Mv1AVydtOh+rhhwdU=
You can generate this file in linux by typing:
htpasswd -c /path/to/my/htpasswd testuser