If you have the manual for the saw, it will tell you how to properly set up and adjust your particular machine.
The tracking adjustment tilts the top wheel in relation to the bottom wheel. There should be a knob behind the upper wheel that controls this tilt. Make sure the blade is properly tensioned, then turn the upper wheel by hand (please make sure the saw is UNPLUGGED) while adjusting the tracking knob. You should see the blade move one direction or the other on the tire. You want the blade to run close to the center of the tire.
If you still have trouble, try another blade. Beyond that, you may have to check that the wheels are coplanar (lined up with each other).