How do I change the screen colour on a public computer?

To use screen masking on public computers:

• Click the Start menu and begin typing ReadAndWrite
• Click the ReadAndWrite icon to launch the program
• Click the arrow next to the textHELP (or jigsaw piece) button in the top right
• Go to Current Toolbar, then Reading Features
  
• Click the arrow next to the Screen Masking icon and choose Screen Masking Options...
  
• Under Select Masking Type, select Tint my whole screen. The are other options available to try if you prefer.
  
• Choose the colour and opacity. If you've chosen a different type of masking which uses underlining you can set the thickness here.
• If the spotlight feature on the mouse pointer is distracting, click the Spotlight tab and untick the box next to Use the Mouse Spotlight when tinting the whole screen
  
• Click OK
• To turn screen masking on and off, click the Screen Masking button on the ReadAndWrite toolbar