Windows 7 starter has no official option to 'change desktop wallpaper' -- it is fixed to whatever. There is a hack to change it, involving swapping out the image that windows thinks is the default picture. There is a manual way to do it, and there are programs to change it for you. Google "windows 7 starter wallpaper switch" and you'll get what you seek :)
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I think you're asking how to change the logon screen image? Go here: http://www.intowindows.com/how-to-change-windows-7-logon-screen-easily-without-using-hacks-tools/
Thank you! But...I am using Windows 7 Starter edition and there is no such option 'Personalise' by right-clicking on the desktop.
right click on desktop and select personalise.