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This means, use your favourite FTP programme to connect to your site, go inside your administrator directory and remove the .htaccess file. If you don't see that file it's because it is normally hidden. Files starting with a dot are always hidden on UNIX derivatives, including Linux, the operating system most likely in use by your server. You can always create a blank (no contents) file named .htaccess and upload it to your administrator directory in order to reset the password protection.

IMPORTANT! You may also have a .htaccess file in your site's root, that is one directory above your administrator directory. Do not remove that file as it is required for the correct operation of SEF URLs.