Which App. The App will display a form or similar image on the phoneu2019s screen, and then you use the touch screen on the phone to select the field you want or scroll the page up or down (or even side to side). When you select a field that allows text to be entered, the phone will normally display an on-screen keyboard on the lower part of the screen that allows characters to be entered into the field.Once the form or whatever is complete, you can normally scroll to the point where the Enter/Send/Confirm (or whatever) button is displayed. Tap the button and the App does the next stage for you, such as sending a form to a website.Apps such as calculators tend to offer their own keyboard and the image that is displayed is purely a set of buttons. Each button performs the action shown.