Hello,
1, 2) Try to disable third-party plugins, very likely one of them caused issue.
3) First you need to disable demo footer blocks in Theme Options->General then create footer manually.
Please read more in our documentation:
https://www.8theme.com/demo/docs/woopress/index.html#!/9_footer
Also you can watch video tutorial:
https://www.youtube.com/watch?v=KWAQRXZXsaw
The video tutorial is for Royal theme, but the process is identical.
4) Please add an empty text widgets to Place in header top bar in Appearance->Widgets.
5) Please don’t worry about this message. It doesn’t affect the work of your website.
Also it will be fixed in the next theme update.
Regards,
Robert Hall.