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You can use custom header image which you can find under Appearance - Header, but you will have to slightly edit that header area since image itself will be place right below header content.
There are several form thread on this already, just to name few of them:
https://colorlibsupport.com/t/how-to-reduce-header-paddingmargin-on-top-in-travelify/
https://colorlibsupport.com/t/how-to-remove-white-space-around-header-images-and-or-logo-in-travelify/ -
If you mean that yellow shaded area then you can replace it by adding this to Theme Options - Other - Custom CSS
#main {
{ background-image: url(‘https://colorlib.com/travelify/wp-content/themes/travelify/images/background.png’); background-repeat: repeat; background-position: top left; background-attachment: scroll;
}
There is no recommended dimensions for that area since it is dynamic and it will depend of number of posts, your post length, image size, etc. The best approach is to use a tiny pattern image and repeat it unlimited times. Theme demo use this approach for background image.
YOu can replace default background image via WordPress Dashboard - Appearance - Background.
- Social media icons can be added via Appearance - Theme Options - Social Links. Just copy/paste your links in the right fields and save changes. No rocket science here.