1. Disconnect the battery. This is a safety precaution to prevent any electrical shocks while you're working.
2. Locate the ignition cylinder retaining pin. This is usually located on the top or bottom of the cylinder. It may be covered by a plastic cap.
3. Insert the ignition cylinder retaining pin removal tool into the hole and turn it counterclockwise. This will release the ignition cylinder from the column.
4. Remove the ignition cylinder from the column. Be careful not to damage the wires connected to the cylinder.
5. Inspect the ignition cylinder and key. Look for any damage or wear that could be causing the cylinder to stick.
6. If the cylinder is damaged, replace it with a new one. Make sure the new cylinder is the same size and shape as the old one.
7. Reinstall the ignition cylinder. Insert the cylinder into the column and turn it clockwise until it locks into place.
8. Reinstall the battery.
9. Test the ignition cylinder to make sure it's working properly. Insert the key into the cylinder and turn it clockwise. The cylinder should turn smoothly and the engine should start.
If you're not comfortable replacing the ignition cylinder yourself, you can take your vehicle to a mechanic.