How do you put a needle in a Singer simple sewing machine?

To insert a needle into a Singer Simple sewing machine, ensure the flat side of the needle faces the back.

Here's how to change the needle, based on the provided reference which focuses on SINGER® SIMPLE™ 3337 Owners Class:

1. Make sure the machine is off for safety.
2. Loosen the needle clamp screw.
3. Remove the old needle.
4. Take the new needle, noting that it has a flat side.
5. Insert the new needle with the flat side facing the back of the machine.
6. Tighten the needle clamp screw to secure the needle.