Ubuntu-9.10 in USB stick

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http://www.linuxforums.org – Hey, I wanted to install Ubuntu-9.10 in my laptop, currently which has both windows and ubuntu-9.04. I'm trying to make it fully into linux box. I downloaded ubuntu-9.10 from ubuntu site and with 3rd party software( sorry forgot the name ) copied the ubuntu folder to the usb stick. Once I open my stick it shows install ubuntu display, once I'm in , I'm struck how to go for install. Now how do I install ubuntu-9.10 from my usb stick to convert my laptop to linux wholly. Any help would be great! (HowTos)