Start the indexing process for your site using this form. The password is the value of $INDEXER_CGI_PASSWORD in conf.pl (you can only use this form if that value is not empty).
On first use you'll have to set the action value in this file (index_form.html) to your server before you can use this form.
Warning: It is much more secure to use ssh to login the server and start indexer.pl from there.