I cant understand, how to debug? In android it in "Settings - Developer options - USB debugging". but in iphone with ios 7 I cant find it. Maybe the developer options menu is hidden, but how to show it?
I'm using Xamarin.IOS in Windows 8.
iOS does not allow any kind of USB debugging with an ordinary device. If you have paid for an Apple Developer account, then after provisioning your device, developer options will become available. However, unless you have done that, you will not be able to debug.
It's a sad fact.