Handwheel doesn't move needle

Sounds like the connection between the handwheel and the needle as disconnected (needle bar). It appears from the picture that this is a version of a mass-market product geared for kids/very light duty sewing.

If so, you may be able to reconnect this by removing the side-cover or top-cover of the machine (if removable). The problem is going to be re-timing the needle with the hook/bobbin assembly.

If you are unable to reconnect or get the timing correct, a good local machine dealer/repair tech should be able to take care of it for you. Unfortunately, the cost of having a technician fix may be way more than you want to pay or the machine is worth.

Best of luck with your repair,
Kim & Linnette