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1. Right Click your deskptop
2. Select "Display Settings"
3. It will show something like the following:
4. 
5. Your computer will assign a number to each monitor to check what number they are assigned to select "Identify"
6. A big number on each screen will show up which relates to the image.
7. Click and drag the monitor to the location you prefer.
8. Once you are happy with the layout select "Apply"
9. Image Modified
10. Done