Scrolling up and down

Hello, There is a simple form in an IOS App. It is working well in the simulator but when I run it in actual IPhone mobile I can't scroll it up or down so when I want to fill the form the keypad appears and covers the sending button. What I want is making the user able to scroll the form up and down in order to show all the fields and the sending button. You can see the screenshot for the form. Thanks