This tutorial shows how to add Windows Media Player tile to start screen in windows 8 using mouse
STEPS
----------
1) Type Windows Media Player
2) Right-click Windows Media Player
3) Click Pin to Start
4) Click on the empty space (to hide the search bar)
5) Scroll to the end
6) The Windows Media Player tile will be available at the end of start screen.
7) Click and drag the tile to any place on start screen