If you use a laptop, and the cursor's movement is erratic, or it does not move at all, try cleaning the touchpad with rubbing alcohol.
Make sure the touchpad (and your fingers) isn't dirty and doesn't have liquids or food on it, because the touchpad has to make a good contact with your fingers (i.e. feel them), in order to work correctly.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.