Use two fingers on the trackpad and swipe up or down
Swipe left or right with two fingers to scroll horizontally
Move two fingers faster for faster scrolling
Use one finger on an external mouse scroll wheel
Use the arrow keys on the keyboard
Press the Space bar to move down a page
Press Shift + Space bar to move up a page
Use the scroll bar on the side of the window if visible
Enable scrolling in System Settings if the trackpad is not responding