You have to include 2 files in the directory you want to protect: .htaccess and .htpasswd.
Here are the contents of the 2 files to protect the access to the protected directory of the user monlogin. Contents of file .htaccess
AuthUserFile /home/monlogin/public_html/protege/.htpasswd
AuthGroupFile /dev/null
AuthName "Zone Accès Limité"
AuthType Basic
<Limit GET POST>
require valid-user
</Limit>
Contents of the file .htpasswd
login1:mot de passe1 crypté
login2:mot de passe2 crypté
login3:mot de passe3 crypté
Crypted password corresponds to the user password that you have encrypted with the utility that you will find here http://www.ebusiness.be/cgi-public/...
The contents of the file .htpasswd look something like this :
jean:sFkd45mpù
pierre:d3?((5efg
jules:f2frkldgfs