No support

How do you think I can solve my topics if you reply once a month?!
Please explain…..
Are you able to tell me how create a “back “ button that appear when scroll down?
Are you able to tell me how disable the screen until you have clicked OK on cookies banner?
Are you able to tell me how remove the overlay in my boat images?
Are you able how to put ONLY the logo in the center when the site is open and after scrolling it disappear? So when scroll up appear the header with another logo and the burger at right and the email at left?!……