To modify search form go to Theme Options > Header > Search view and select “Form on hover”.
Sorry, but Newsletter option on 8theme site is created only for our site.
To have Newsletter form in pop up window you need install MailChimp plugin http://wordpress.org/plugins/mailchimp-for-wp/ . More information you can find in our documentation: https://www.8theme.com/demo/docs/royal/#!/1_static_blocks
What version of Visual Composer plugin are you using?
