Unscrew the miter gauge's handle, which will allow you to move the gauge.
Rotate the miter gauge to the desired angle, then screw the handle tight to lock that angle in place.
Place a board against the miter gauge, which will hold the board at the desired angle against the saw blade. Position the wood against the saw blade where you want the cut.
Slide the rip fence over to the end of the board and tighten it in place. The rip fence ensures that the board does not stray past the desired position.
Turn the wheel on the side of the table saw to raise the blade to 1/4 inch higher than the board's surface.
Put on a pair of safety glasses, and turn on the saw.
Hold the board against the miter gauge, and push the board against the saw blade, making your cut.
Turn off the saw immediately after your cut has been made.