• Unzip bp-branded-login.zip
• Move blogin folder to your current theme
• Upload bp-branded-login folder to wp-content/plugins directory
• Login to WordPress backend
• Go to Dashboard->Plugins->Installed and look for "Branded Login for Buddypress"
• Activate the plugin
• If you are using BuddyPress 1.5+, Please create  pages for login/logout/reset password(You will see a notice at the top of the wp-admin, once you activated this plugin)
• Assign the pages to Login components in the BuddyPress->Pages screen
• that should be it.