Article: If you switch back and forth between Desktop and Modern (the UI that Windows 8 uses), you may want to pin your most used Modern apps to your Desktop's taskbar. This will let you easily open them while in Desktop mode. You can pin any of your Live Tiles, or move down to the All Apps screen and pin any of the apps listed. This will add a shortcut to the app on your Desktop taskbar. This is especially useful if you want to get rid of the Store button that appears on the taskbar after updating to 8.1.
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Open the Start screen. Right-click on the app you want to pin. Select "Pin to taskbar". Right-click on pinned apps and select "Unpin this program from the taskbar" to remove it.