These are the steps from power on to Time Lapse finish...
Turn on the camera.
Wait for ML to load.
Press the Trash button.
Press the Right Button until shoot is selected.
Press the Down Button untill you select "Take a pic every".
Press the Set Button to increase the value.
Press the Display Button to decrease the value.
Press the Down Button until you select "Intervalometer".
Press the Set Button to turn it on.
Press the Trash Button to exit the ML Menu.
The Intervalometer will start upon exit.
Follow the on screen instructions to exit the Intervalometer or press the Trash Button again while the Count Down Timer is going and turn off the Intervalometer that way. I sometimes have trouble with the Play Button stopping it so that is what I do.