Grandfather clocks play at least one chime, which is usually Westminster. They are called single-chime clocks. Some clocks can have multiple melodies--usually three. They are called triple-chime clocks. You can tell how many chimes your clock has by looking at the dial. If your clock has a triple chime, you will see a dial with multiple positions.
Move the selector lever from the "Chime-Silent" position to one of the chimes indicated on the dial. Sometimes the chimes are marked "Melody 1" or something similar. Don't move the selector while the clock is chiming, and it's a good idea not to move it within five minutes either way. Some clocks can tolerate the selector being moved close to the chime time, but some can't, so be safe.
Make sure the lever rests in position, not between positions. As you moved the lever you would have felt it fall into position. It's important. Check it by moving the lever again if necessary.
Switch the Automatic Night Shut Off (ANSO) lever to the off position if you want the clock to chime all the time. If the lever is in the down position, the clock will chime all the time. If it's up, it will turn the chimes off between 10 o'clock and 6 or 7 in the morning. The ANSO lever is usually under the dial, but should be marked so you can look for it if it's elsewhere.
You can use the ANSO switch any time. It's not necessary to change it more than five minutes on either side of the chimes.