run text in upward direction

here i cannot able yo use GUI.ScrollTo i want to scroll text upward direction automatically when the scene load after the automatically scroll is over i want use normal mouse to scroll upward and downward direction here teacher is teaching a class student when teacher teach the text should run automatically in upward direction without using mouse after the whole text goes up the text should come to normal postion so that user can use mouse to move text upward and downward direction it is urgently needed any help for this i need it urently for a project any help is welcomed i tried a lot not getting the correct answer