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@hazelnot That depends on the ball.
Old old style ones, click and drag the scrollbar like it's 1992.
Thumb trackballs usually have a scroll wheel.
Mine, both my big one (pictured) and my shittier one in the basement, have a ring around the ball for scrolling. This is my favorite method.
The Slimblade from Kensington, looks like a futuristic of mine, you twist the ball.
I have also seen one where left button is a touch pad, but touching (one finger) is scroll, pressing still clicks.