my son has turned on voice over on his iPod touch & now I am unable to turn it off.

My son has turned on Voice Over on his iPod Touch and now I am unable to turn it off. Apparently you cannot scroll when you are in this feature? I have tried the triple-click but it just makes his screensaver picture negative. I have gone into Settings, then General but again I am not able to scroll down to Accessibility. I have looked and searched and tried everything I can think of. Please help!