I found this by doing a search, I never knew what that thing was called, looks like it is called a "command point" , as stated in step 5 below.
Moving the Pointer on the Screen
Things You'll Need
Laptop Computer
Steps
1 Step One
For a trackpad, gently glide your index finger across the trackpad surface to move the pointer. The pointer moves in the same direction as your finger.
2 Step Two
Position the pointer and gently tap the trackpad to select an icon, text, or a graphic.
3 Step Three
Double-tap the pad (or double-click the trackpad button) to open an icon.
4 Step Four
To drag, position the pointer on an icon and tap the trackpad twice, but keep your finger down after the second tap and drag it in the direction you want the icon to go. (It's a down-up-down motion.)
5 Step Five
For a command point, gently guide the command point with your index finger to move the pointer. Push the command point to move it faster.
6 Step Six
Guide the command point in the direction you want the pointer to move. These tend to need a light touch.
7 Step Seven
To drag, position the pointer on an icon, press the left button on the wrist-board (it's easiest to do this with your thumb or another finger), and then move the finger on the command point to move the icon. Release the button and the command point when you've got the icon where you want it.
