1. Unfortunately, we don’t have option in Theme Options to change it but you can use translation files and use translation filed just to change the text. Loco translate plugin will help you to do this in no time http://xstore.helpscoutdocs.com/article/30-base-theme-translation
2. You can edit header structure file depending on header type that you use, in your case, it is xstore/headers/advanced.php. Do all the changes in child theme files.
Thanks for your quick response. I am not looking to change the language of the site but to change the text “Type here…..” to maybe “Search for Products” They are all English just need to change the words
Site URL: hidden Theme version: Xstore 1.0 WooCommerce version: Version 3.2.6