On the left side of the window, there may be a vertical bar known as the scrolling bar. This bar allows you to view text which has scrolled off the top of the window. Just move the mouse so the cursor is in the vertical bar and press the right button to scroll up into the window. The left button will scroll back down towards the text you could see at first. (The middle mouse button allows one to scroll up and down more smoothly.) Pressing return inside the window should bring you back to the prompt.
