can't enter passcode

What happens when you try ? Does the screen not respond at all ?

If the screen doesn't respond then have you tried a reset ? Press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider if it appears), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.

Touch or tap the field that you want to use/select and it should get a box around it ; then double-tap that field to activate/type it. Once you've entered your password you can do the same (i.e. touch to select, double-tap to activate) to gradually get into Settings > General > Accessibility > VoiceOver and turn it off.

So to enter your passcode you first need to tap the 'slide to unlock' button to hightlight it (it should get a box around it), then double-tap it to unlock it. Then for your passcode tap the digit that you want and it should get a box around it; then double-tap that digit to type it; and similar for the other three digits in your passcode.

To enter a digit you need to tap the digit to hightlight/select it (it should get the box around it), and then double-tap it to type that digit; then do similar for the other digits (tap to highlight/select then double-tap to type it). Is that what you are doing ?

I don't know, I'm not in the USA, but I doubt it

Just had another look at the manual (http://support.apple.com/manuals/#ipad) and you should also be able to switch voice-over off by connecting to your computer's iTunes :

Turn VoiceOver on or off in iTunes: Select iPad in the iTunes sidebar. In the Options section of the Summary pane, click Configure Universal Access. Select VoiceOver, then click OK.

So select Configure Universal Access at the bottom of the Summary tab and set Seeing to Neither

I have a iPad 2 and I can slide but the pad to put the password won't appear