I can't connect my iPhone 4 to itunes when it told me too?

Okay, so basically, I changed my password because everyone at school kept going on it. I changed it, and then I forgot it. So I tried to get into it, It was just a simple number password.
My iphone 4 is telling me to connect to itunes, so I plugged my iphone 4 in, and my laptop just said "Please respond on your phone to allow access" but I can't get on my phone to allow it.

I'm not sure what to do? Anyone have any ideas?

You can bring it to the nearest apple store. They will help you there. Bur next time you change your password, go to www.my2centstips.com, they help you get a new password that you won't forget and that nobody will be able to guess!