The official wallpaper for your smartphone is exclusively for members of the “Relish for you” group. Click on the photo orDownload image link
On Android: go to Settings / wallpaper, select the "source" from which to take the wallpaper (eg Gallery, Photos, etc.), choose the image to use as wallpaper, tap the OK button and then the Set item.
On iPhone: go to Settings / background choose a new background, tap on the position where the background you created is located (eg. All photos), press on the image you want to use as a background, press the Set item, indicate if you want to use wallpaper for your lock screen, home screen or both and that's it!