When I touch my board the cursor is slightly off from where my finger is.
Once in a while you’ll find that your cursor may not match exactly where your finger touches. This is predominantly caused by movement in the projector, or when a new computer is plugged into the board. It simply means that your board needs to be re-calibrated. It’s quick and easy:

Step 1: If your board is fitted with a calibration button (this will be located around the edge, usually above the board) then push the button. If you cannot find a calibration button use your computers keyboard by taping the scroll lock key six times. You should hear now hear a beep and see that your mouse cursor has moved to the top left hand side of the board. This is what is called “calibration mode”.
Step 2: Taking special care to hold your finger perpendicular to the board’s surface, touch and stay on the cursor’s position till you hear the board beep (around one second) then release.
Step 3: The cursor will then move to the top right hand side of the board—Repeat Step 2.
Step 4: The cursor will then drop to the bottom right - Repeat Step 2.
Step 5: The cursor will move to the bottom left – Repeat Step 2 and you’re done