[ubuntu] Installing ubuntu as dual boot alongside windows 8

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http://ubuntuforums.org – Hi I am trying to set up a new laptop. It's a lenovo G580 and came with windows 8 on it. I can't get into the boot menu and so I can't get the computer to boot from my liveUSB. I've spent a couple of days now hunting around the internet for ideas and trying different things. I found my way to the PC settings page and tried booting from a different device - but only windows will boot. I am not very tech-savvy - so some of what I have been reading doesn't make sense! I have been using ubuntu for a couple of years, so I'm not a complete newby - and have set up several laptops with a dual boot (Hardware)