Hello,
1/ Elementor > Settings > Post types > enable editor for static blocks. Then edit Footer static block using Elementor.
Provide temporary wp-admin access, so we can take a closer look at your settings.
Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
2/ Colors can be changed via Theme options > Styling, Header builder > colors for header, edit content of pages and static blocks > change colors, change color in Theme custom CSS.
XStore Amp plugin is activated, so you see such result on the Mobile, you can disable that plugin, then a responsive view of the desktop version will be shown.
Regards