just add below code in your .htaccess and save your hrs…
AuthName “Restricted Area”
AuthType Basic
AuthUserFile “your htpasswd file path”
AuthGroupFile /dev/null
require valid-user
SetEnvIf Request_URI “\/$” allow
SetEnvIf Request_URI “\/css/(.*)$” allow
SetEnvIf Request_URI “\/js/(.*)$” allow
SetEnvIf Request_URI “\/images/(.*)$” allow
# write above line for all folder those need public access
Order allow,deny
Allow from env=allow
Satisfy any

allow from all
Satisfy any

You can add additional fields in the Joomla Registration Form and also send that field’s data to the default email that is sent. You just need to follow some simple steps and it is done. Please read the full post to get the solution.