How to change wallpaper in android mobiles & tablets

The process involved in changing your wallpaper is very simple and take just a few steps. On most recent Android phones:
- Long-press on your existing wallpaper on your home screen. (Long-press means you hold your finger down until you feel a feedback vibration.)

- Tap Wallpapers.

- Browse the existing choices of wallpaper and live wallpapers at the bottom of the screen or tap My Photos to choose a photo from your gallery. 

- Live wallpapers no longer look any different than standard wallpapers from a browsing perspective, but the final wallpaper will be interactive.

- Tap Set Wallpaper to finish the process.


On older Android phones:


- Tap your Menu - This will bring up a list of options that will include a shortcut labeled "Wallpaper."

- Tap Wallpaper -Your screen will show the three wallpaper options you have to choose from.

- Choose from Gallery, Live Wallpapers or Wallpaper. -Selecting each option will bring you to the available images under each choice. Choosing "Gallery" will bring you to your saved images and photographs.

- Tap the Set Wallpaper button once you decide on your new wallpaper.

Once you set your wallpaper, you will be brought back to the main screen where you will be able to admire the new, customized look of your Android smartphone's appearance. Go through the same steps anytime you want to change the look again.

credits: https://www.lifewire.com