How to change windows 8.1 Background

Changing Background Images and Color on the Windows 8.1 Start Screen

Windows 8.1 enables you to change the background and colors in your Start screen. Although you have the ability to control the colors in Windows 8, it’s much easier to change them in Windows 8.1.
To change the background and colors, follow these steps:

To see your desktop background on Start

You can use your desktop background picture as the background on your Start screen. Start will update automatically whenever the desktop background changes.

1. Open Start by swiping in from the right edge of the screen and then tapping Start. (Or, if you're using a mouse, point to the lower-left corner of the screen, move your mouse all the way into the corner, and then click Start.)
2. Swipe in from the right edge of the screen, and then tap Settings.
   (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Settings.)
3. Tap or click Personalize, and then tap or click the preview of your desktop background.
   
   

   To pin apps to Start

   You can pin your favorite apps to Start so you can get to them quickly and see updates from them at a glance.
   1. Open Start by swiping in from the right edge of the screen and then tapping Start. (Or, if you're using a mouse, point to the lower-left corner of the screen, move your mouse all the way into the corner, and then click Start.)
   2. Swipe up from the middle of the screen to go to the Apps view. (If you’re using a mouse, click the arrow button in the lower-left corner.)
   3. Browse to the app you want to pin and tap it or right-click it to select it.
   4. Tap or click Pin to Start.

   To unpin apps

   Unpinning an app is different than uninstalling an app—if you unpin an app from your Start screen, the app will still show up when you search for it, and it’ll still be in the Apps view if you need to find it again.
   1. Open Start by swiping in from the right edge of the screen and then tapping Start. (Or, if you're using a mouse, point to the lower-left corner of the screen, move your mouse all the way into the corner, and then click Start.)
   2. Press and hold or right-click the app you want to unpin to select it.
   3. Tap or click Unpin from Start.

   To move a tile

   1. On the Start screen, press and hold a tile you’d like to move. (If you’re using a mouse, click and hold the tile.)
   2. Drag the tile where you want it.

   To resize a tile

   1. On the Start screen, press and hold the tile you want to resize. (If you’re using a mouse, right-click the tile.)
   2. Tap or click Resize, and then pick the size you want.
   
   

To change the background

1. Open Start by swiping in from the right edge of the screen and then tapping Start. (Or, if you're using a mouse, point to the lower-left corner of the screen, move your mouse all the way into the corner, and then click Start.)
2. Swipe in from the right edge of the screen, and then tap Settings.
   (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Settings.)
3. Tap or click Personalize, and then tap or click the background, background color, and accent color you want. The background and accent colors you pick will show up in a few other places too, like the charms and the sign–in screen.